I don't see any rush to trade RNH simply because he's a bit overpaid. He's a young center and IMO, running all of McDavid/Draisaitl/RNH is the key to being a dominant team. Those three create matchup nightmares and make the Oilers entire forward group a threat to score at all times. They just need to add cheap wingers, which shouldn't be too hard - Vrbata, Parenteau, Gagner, Leivo, Strome, Marchessault.
If Letestu is 4C/RW with Khaira/Kassian, that's a much better scenario than either of those two (Letestu/Kassian) playing third line or higher.
I love Maroon and he provided some scoring but I'm not paying him 3.75-4m.