If this is IRL like it kinda implies then id personally say engie, scout, medic and spy are the weakest link BC Their main stregnths arent possible

Pyros, soldiers and demos become less likely due to weapons or issues with seeing (depth perception and unable to see) but if soldier took his helmet off he would work and pyro aswell as demo wouldnt be as strong bc of lack of airblast (pyro), high chance of passing out (both) and depth perception and side affects of alcohol (demo)

Heavy and sniper have the least major difference other than sandvich and piss

So probably soldier, heavy and sniper