Bob Ligashesky was not let go. Fran's plan was to retain him. Ligashesky was involved in all of the transition activities, the recruiting events w/ the new staff, and the bowl game. Shockingly, he suddenly left for a Big 10 offer in January.
It seems to me, Fran had the whole crew in mind to be on his staff before he got the SU job, except the ST position was just not something he had all lined up. When Lig quit, the entire staff was set, but he had to find a ST coach kind of late in the game for anyone in D1. I also don't think STs is/was really in Fran's wheelhouse, as you could see problems with the unit not getting resolved.
He gets a second chance at this, and hopefully they do a really good job finding someone qualified. Historically, SU is practically punter/kicker U.