A good argument can be made that guys like Sonny or JG are/were weak sure.

These guys took the easy way out. Robbing, theiving, extorting etc. It's hard to work a legit job, starting at the bottom, manual labour year after year, cold weather trying to work your way up, minimum wage etc etc.
It's a lot easier to pick up a gun to get your money.

So you're damn right an argument can be made that these guys are weak.

Strength is measured in more than one way.

You wouldn't say a guy who beats the shit out of his wife isn't weak would you? He's weak as fuck, pathetic, even though he may be physically strong.