The facts do not indicate they are close. Manny Diaz and Dan Mullen have much more significant ties than Diaz/Baker. Mullen hired Diaz to be his DC twice. Should we also assume that Diaz and Mullen are secretly FaceTimeing each other every weekend and talking about their girl problems?
Diaz hired Baker as a LB coach at La Tech, then left a few months later for a different job. 4 years later Diaz hired Baker to be his DC, who was on a lot of programs radars as a potential DC candidate, so it's not as if Diaz hired his wife's cousin's nephew (as recently as last May he was on a list with Marcus Freeman as a "top 15 DC to watch this fall" )
There is nothing in particular to indicate that Diaz has a close intimate friendship with Baker or anything beyond the mutual respect that coaches usually have.
Again this is all because Diaz didn't fire Baker immediately after UNC. This is now causing many posters to invent fantastical narratives and claim that the only possible reason why Diaz hasnt made a public move yet is that in the 5 years in between Diaz leaving LA Tech and then hiring Baker as DC at Miami, Diaz and Baker were so close that they would meet up every Thursday to get couple's mani-pedis.