I would probably be rooting for BU to upset Bucknell. If Lehigh then wins, then wins out, they’d have a chance at the reg. season title no matter what happens (if not the No. 1 seed).
In a 3-way tie it could come down to records vs. Navy or Colgate as to whom is the No. 1 seed. Bucknell would be 2-0 vs. Navy in that case, and Lehigh would be 2-0 vs. Colgate in that case. Bucknell still needs to play Navy and Lehigh still needs to play Colgate.