The cap is pretty easy to hit with a double maxwell on UBB. A unit with a base atk stats of 4500 need only approx. 2889% atk mod. Double Maxwell on UBB already gives 1220%. Taking an average SBB mod of 620% plus a 400% buff from units like Lauda, you'll be already on 2240%. And we haven't even taken into account Spheres, Elgif, unit ES and SP. Plus a Breaker type needs even less mod to hit the new cap with a approx 300 more attack points added to its base stats.