So this happened: https://www.youtube.com/watch?v=FotT8mc18Nc&t=37s
While trying to serve as a voice of reason, Stinger Flynn intervenes, only for Jumbo Josh to slam him down. Not gonna use the wiki outside of pictures and actual in-game info since info from the wiki is very finicky (the wiki is prone to vandalism). Now, the first thing I have to measure is Jumbo Josh's size in relation to Banban.
The video quality's a bit rough, so bear with me.

The first thing I did is measure Banban to Josh. Since Banban is evidently human according to his data file, I'll assume he's 5'9", or 1.7526 meters tall like an average human. Jumbo Josh has a head size of 90 px while Banban is 93 px tall. Let's see how tall Josh's head is.:
90/93*1.7526=1.696064516 meters
That's 1.696064516 meters tall for Josh's head.


Alright, so I had to use two different screencaps for this, which are both thankfully from the same camera angle. Based on what we could tell, Flynn's eye is 84.2 px tall while Josh's head is... That number tall. Let's see how tall Flynn's eye is.:
84.2/69*1.696064516=2.069690323 meters
While measuring Flynn's eye is the easy part, measuring Flynn's volume is going to be very... Complicated. Why? I'll show you.

While Stinger Flynn has a character model that is very simplistic-looking to the average eye, measuring the volume of him is going to be complicated to say the least. Here, I have to use divide and conquer, and Flynn's model consists of the following:
- 1 large semi-ellipsoid (head)
- 1 frustum (section between head and bulb cones)
- 6 cones (bulb cones)
- 6 cylinders (tentacles)
- 6 small semi-ellipsoids (nubs of the tentacles)
You can see where things can get a little difficult. I'll have to take care of each part individually to get a rough measurement of Stinger Flynn's volume. Here are the dimensions of every part I need:
Eye Height: 240 px; 2.069690323 meters
Head Height: 854/240*2.069690323=7.364648065 meters
Head Diameter: 1448/240*2.069690323=12.48713161 meters
Frustum Bottom Diameter: 1339/240*2.069690323=11.54714726 meters
Frustum Height: 235/240*2.069690323=2.026571774 meters
Bulb Cone Diameter: 429/240*2.069690323=3.699571452 meters
Bulb Cone Height: 378/240*2.069690323=3.259762258 meters
Tentacle Length: 2963/240*2.069690323=25.55205177 meters
Tentacle Diameter: 93/240*2.069690323=0.802005 meters
Tentacle Nub Length: 79/240*2.069690323=0.6812730645 meters
Okay, first comes the head. Simple enough, just use the ellipsoid volume formula (4/3*π*a*b*c, where a, b, and c are individual radii of the ellipsoid and divide by 2 for a semi-ellipsoid).
Head Volume: (12.48713161/2)²*7.364648065*π*4/3=1202.557896/2=601.278948 m³
Next comes the frustum, which... Well, I'm gonna have to use this: https://www.calculatorsoup.com/calculators/geometry-solids/conicalfrustum.php
I plugged the values in and got 229.9722572591 m³: https://prnt.sc/WabwHFYaSer7
Now, for the bulb cones. Measuring the volume of a cone is simple enough: 1/3πr²h
Total Bulb Cone Volume: (3.699571452/2)²*π*3.259762258/3=11.68039132 m³*6=70.0823479 m³
The tentacles are the last bit and thus the easiest. Here goes.
Total Tentacle Volume: (0.802005/2)²*π*25.55205177=12.90832264*6=77.44993582 m³
Now the nubs...
Total Tentacle Nub Volume: (0.802005/2)²*π*0.6812730645*4/3=0.4588851337/2=0.2294425668*6=1.376655401 m³
Now, let's add all them together...
Total Volume: 601.278948+229.9722572591+70.0823479+71.8300451+1.376655401=980.1601444 m³
Not exactly 1000 cubic meters, but hey, 980.1601444 m³ is pretty big. According to his file, Stinger Flynn's body is composed of both Atlantic sea nettle and human DNA. Based on a body fat composition of 16% (https://www.thoughtco.com/chemical-composition-of-the-human-body-603995 ), a lean density of 1.1 g/cm³, and a fat density of 0.9 g/cm³ (https://en.wikipedia.org/wiki/Body_composition ), a human would have a density of 1.068 g/cm³. In contrast, a jellyfish's density is 1.025 g/cm³ based on an assumption made by a study on moon jellies: https://www.sciencedirect.com/science/article/pii/S2095034918301028
Adding these values together and dividing by 2, we can get a rough density for Stinger Flynn.:
(1.068+1.025)/2=1.0465 g/cm³
That's 1.0465 g/cm³, or 1046.5 kg/m³. Let's see how much Flynn weighs.
980.1601444*1046.5=1025737.591 kg.
This already puts Jumbo Josh's strength at Class M, albeit just barely. Now, let's see how fast Josh slammed Flynn down. See, I measured the full height of the bell of Stinger Flynn for a good reason here. The cones of Stinger Flynn's bell cap touch the ground. According to the measurements taken before. the bell has a complete height of 1467 pixels. Let's see how big that is.:
1448/240*2.069690323=12.6509821 meters
The slam appears to be the result of Josh turning Flynn 90 agrees using the bottom-right side of Flynn's head as the anchor point for the spin. Let's see how far Flynn's head went.:
12.6509821*π*2/4=19.87211621 meters.
The head seems to have hit the ground at 7 frames from the moment it started to tip. The video has a frame rate of 30 FPS. Let's see how fast the head went.:
19.87211621/(7/30)=85.16621232 m/s
Damn! That's fast! Now, let's check the KE of the slam.:
1025737.591*85.16621232²/2=3719982886 joules
That's 3719982886 joules, or 0.889097248 tons of TNT. That's Building level! Damn! So yeah, there you have it.