Muscle is muscle. The big "squishy" muscles just means they're making excuses for being fat.
As for your other question, although I would wait for someone who knows what the hell they're talking about to answer, I think that muscular endurance can be built up fairly effectively by having very short RIs and playing with isometrics and rep timing.
For example, one thing I've been playing around with is the one and a half pullup. That's where I do a full pullup, then on the next rep I do half of a pullup and pause for 2 seconds or so, lower, rinse and repeat until dead.



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