look, deadlifts will add some thickness to abs for sure but it will be compensated by other groups growing.
can you gain mass without doing squats or deadlifts sure...but why would you do something that is not as effective as those exercises? also for a natural, you gotta do the basics. some steroid abusers can grow big legs without squatting..but even most of those squat...until they are squatting 550-600 or more for reps..(because at that point squats can become very dangerous) and when that happens they use leg press (after they built a solid foundation) or hack squats and can afford to be more lazy.
also i doubt you have 30 inch legs or are anywhere near as thick as the mentioned guys.
I'M STARING TO LIKE THE BULLSHIT YOU POST! good words man! NO BULLSHIT!
And what are you talking about being lazy when your squats hit 500-600lbs?! That's when you start seeing some actual size on your legs! You cut your teeth on teh bullshit weights on the way up to 500! My legs are finally a solid 28" all thanks to squatting. They never broke 26" no matter how many leg presses, hacks, extensions, or whatever else I did. Squats are king.
let me rephrase that...FREE WEIGHT SQUATS ARE KING! Smith machine makes it even more dangerous than a regular squat. Instead of letting your body follow it's own path, you're stuck with the machine's under heavy ass weight. DUMB!