When you've got a full 11-man team on the field, then suddenly have seven extras thrown in, your practiced group is no longer a team.
Yeah, I get that but Lehman isn't exactly an unbiased commenter and the Marines didn't fail to do things right because other units from other services were doing different things all over the island. It wasn't so much a coordinated invasion than several different operations running in parallel on a small island with the same overarching goal.
Hard lesson were learned by almost everyone involved and they paid dividends 6 years later in Panama and 8 years later in Desert Storm.
Either way I am not sure how armed MV-22's would have helped!