Yes...because jersey design funds come directly out of the salary cap?
No, but spending money on new uniform designs and signing players both come out of the Glazers bank account. If they spend say... $1 or $2 mil on redesign, that's $1 or $2 mil less they would have to spend toward salary cap, which may make them hesitant to write out player checks.
Is your brain the size of that dog's brain in your av?