Id only move Petrovic in a deal like this due to "losing" him in Exp draft. The RHD depth is there for Florida, but that doesn't mean they have to deal those guys away.
Yak COULD fit on a line with McCann and Bjugstad at centre, but that line scares me defensively. They better have the puck A LOT (anyone have hero chart on Yak?). Yaks ceiling would be Jagr replacement on 1st line with Huby and Barkov in two years time and maybe by the playoffs this year. That seems like pie in sky , but could be an option at less cost/term than other expensive options out there for Fla.