I think it's a reach to say Jenner can take over the 3C role this season. He has played EIGHT games at center in the NHL. I believe he needs time before he is thrust into that role on a team with zero margin for error.
Jenner has probably been our best forward since he returned from injury. Guy is a perfect 3C and can play higher in the lineup if needed. Not sure what you are seeing that indicates he needs more time.
Letestu is a terrific 4C, yet he doesn't have ideal size that Anisimov posesses.
IMO, Letestu is too good for Boll and Tropp and whatever other chaff we throw out on the 4th line. I would have no problem putting him on the 3rd line if needed.
Getting a skilled winger for Anisimov may make lots of sense, in a year or two.
Why would we acquire a skilled winger to play on the 3rd line? You glossed over the fact that Dubinsky will be our 2C for years to come.