I will assume Williams is a better defender than Onyenso, but I'm not sure about Garrison.
They are probably both much better offensively, it seems to me.
Overall, I think we should be better at the 5-spot, but hopefully not foul-prone.
Williams & Garrison combined for 19.7 points, 13.1 rebounds and 3.3 blocks per game.
Onyenso, Bradshaw & Ivisic combined for 13.8 points, 11.4 rebounds and 4.8 blocks per game.
To my view, the key will be whether Williams can step up from Drexel to the much bigger stage, without any dropoff. I find it slightly odd that he only averaged 22.9 minutes per game in his fourth year there, after logging 27.3 the previous year ... ???