boys and girls: meet the relative strength curve.
The more (muscle) mass you have, the more potential strength you get, while getting weaker, relatively to your bodyweight.
Also, potential strength means just that:
I've seen buff guys -even for american standards- hit like girls.
On the other hand also strong, massive dudes who just haymakering their opponent (that would be me...) with terrible punching technique into full defense and knockdown.
It's not etched in stone that strength training will increase something like punching power.
To put even more confusion into it, highly technical strikes can look weakish but still have lot of hard, mean, follow through in them. Especially if the puncher has good aim, posture and timing.
It's a very complex issue.
Personally , I very much believe that strengh training should be a part of a martial artists education.
p.s. Lol@ 5/3/1