The Bucks won with heart.
Connaughton is a 6'5" tweener. He shot awful yesterday, but he played 23 minutes and outrebounded everybody on the Suns except Crowder
PJ Tucker is only 6'5", played 36 minutes last night and didn't even score. But his defense and energy were crucial.
Sure Portis and Lopez are tall, but they played less minutes than the two guys above. To me, it all comes down to effort. The Bucks won this series because everybody, big or small, played hard.
Also add in that Jrue is only 6'3", and played his butt off for 46 minutes.