The nostalgia-heavy Solskjaer era has poisoned people somewhat to the idea of the club looking to involve former players in roles where possible but in truth it's something other clubs do too. The trick is in being able to identify which of your former players actually have the talent and temperament for given positions. If you can do that then they become a valuable resource.
In ETH's case the reports (including the ones when he was being linked to Spurs) have suggested he wasn't interested in bringing a lot of his current staff with him anyway, in which case there may well be room for the club to get someone they regard as a high-potential former player involved. Because they'd have to hire some people from somewhere.
The other key difference with the Solskjaer reign being that ETH is a hands-on coaching-orientated manager, so there would be likely be less delegation in that regard anyway. If you give your coaching staff as much authority as Ole seemed to give McKenna & Carrick then their level of expertise obviously matters more.