TMac may have changed since the Sharks days but I am not sold on him being good with developing young players. He is most definitely a players coach but was never able to get the most out of the loaded Sharks teams.
In McLellan's defense, Wilson had a revolving door of middle six, 4th liners, and bottom pairing guys coming through those teams, and most of his "solutions" were more hail-mary prayers than welll thought out acquisitions imo. They had a great 8 player core or so, and then every year you had 8-10 new faces it always seemed.
Niemii had good overall numbers behind the McLellan system, but he always gave up soft back breaking goals at the worst possible times in the playoffs. I remember two playoff series the Sharks would have absolutely won had they had gotten even average goaltending from Niemi.
I always felt like McLellan did a solid job with those Sharks teams, but a mix of an innability to make adjustments when they needed to be made, and a questionable roster makeup from Wilson was always his undoing in the playoffs.
I have mixed opinions on him being a good development coach. There were times where he seemed to really have the young guys like Pavs and Setoguchi buzzing with confidence, but other times where it felt like some of the younger players that he would bench or give little ice-time to were a bit lost and lacking direction under him, but he was coaching a team that was a cup favorite, which is a tough situation for young players to come into and develop in, so I'll give him some leeway there.
I don't think he is the best development coach, but they could do worse. I also think he is the type of coach that has a 3-4 year max shelf life, so I am not certain he is the best option, unless Francis is looking for just a temporary solution to give the players a more defined system to develop in than what Hakstol brought, which i think some of the young guys could benefit from.