The main takeaway from that appointment for me is it seems likely if he's their choice their DOF will indeed be one of the City employees linked. Going down this road would to me indicate they're going for a pretty substantial restructure and rebuild - an untried manager yet seemingly some cohesion between the appointments for the two positions probably looking to the long-term.
Impossible to say right now either at this juncture, but it might also be indicative of their financial power going forward. Given the links they've already had with City the past few years with multiple players going on loan to them, a move like this might indicate a pivot from splashing out on big fees like they have with Jullien and Edouard and marquee loans like Duffy and Elyonoussi, to relying on young players on loan or with substantial sell-on's from City on maybe more favourable terms. Some of that is obviously true given they patently won't have the financial muscle of years gone past, but it will be interesting to see if they completely abandon their previous strategy in favour of essentially being a farming ground for Man City. I might be stretching that a bit far, but if they are going all-in on City appointments I'll be amazed if that doesn't involve closer links between the teams, which they might be banking on to compensate for their diminishing financial advantage.
All that said, regardless of his supposed coaching credentials if I had to pick a person who I wanted to take that job it would be someone with a CV like that. Inexperienced and foreign, and will definitely need time to get used to Scottish football and have to rebuild that squad with far less financial backing than his predecessors. Wouldn't be unhappy with this appointment at all, bring it on.