Orlov is a UFA and his contract is high end for what he's added to the blue line. He is more than likely gone after the season. That said, it does nothing for this season.
Burns is also a UFA. But I think he's on record saying he wants to come back next season.
Chatty is already getting the same TOI (even strength) as Burns.
Sean Walker and Gost have no business anywhere but 3rd line. Make no mistake, Gost was horrible last night and has had a bunch of bad games. He's here for the PP- that's all.
Next year would like Slavin- Chatty, Nikishin- Burns, Gost- Walker.