Super intrigued to see the lines vs Flint. Will say for Letang this will actually be a hard choice. Johnston should be the guy moving to line 4, but after your GM gave up a solid asset not long ago for him I just don't see it happening.
For me don't touch Kostuch-Di Iorio-Doucette. That trio looks really solid together. Best 17 has looked 5on5 & Kostuch has looked his best lately, Doucette has seemed more engaged with them as well.
After that I think my lines would be
Filak-Wainwright-Karimov
Edwards-Beamish-Johnston
Brown-Moses-Franceschetti
Filak has done a fantastic job at C & he can still take draws on his strong side, PP, PK, late game. But him & 12 had good chemistry together. Gives Karimov two strong, reliable line mates. Line could do a bit of everything.
I want Edwards back at C, but Beamish is a C & you want him to come in & get comfortable before making him play a different position than he's used to in a new league. Be 3 guys who play at a similar speed which I think is better for Edwards than playing with Wainwright. Would prefer Brown with them, but as I said don't see Johnston being on L4.
Someone gotta move down to L4 & i'll go with Brown who's unfortunately having a rough go. Not giving up on him. He has the tools to be a great player. Just been a rough few months.
My guess on what Letang does
Beamish-Filak-Brown
Edwards-Wainwright-Johnston
Kostuch-Di Iorio-Doucette
Franceschetti-Moses-Karimov