The problem with McDaniels going with Bill is that Bill only has a couple of years left and then McDaniels may be out of a job again. Now, MAYBE if that team is really successful, it could be a promotion opportunity for him but that seems like a slim chance.
Conversely if he were to come to NE, he would likely be able to count on a number of years of stable employment as an OC in the region he's happiest in and with an owner that already loves him, and a fanbase that isn't hostile to him.
I could see either happening but there are potential pros and cons either way.