1) Rodgers realises he's inexperienced at the top level and having Pako alongside him would be able to teach them both.
He had his own staff and it didn't work out so the board think he'd benefit from trying out more experienced staff. Thankfully he hasn't let his pride get in the way.
2) It does fail and Rodgers needs to be moved on? We have a capable caretaker who, if he did well, would likely be next in line for the top job.
This works for all parties.
Rodgers will be on his last legs so this is quite clever on FSG's part... an indifferent start to the season or a prolonged poor spell and he can be binned instantly with a caretaker already in place... failing that the pairing may actually work.
Still absolutely gutted Rodgers hasn't been sacked - sick of seeing his smug face, his awful goal celebrations & listening to or reading absolutely anything the man has to say... honestly can't stand the man.