The issue is they need to add another top-six forward to their current crop. Subtracting top-six calibre forwards, getting a different one, and then shuffling the line chart around doesn't really address the fundamental issue: They need more quality overall.
The biggest cap related problem is Mikheyev. He's occupying cap space that should be allocated to an impact player, but isn't. They can probably fill all or most of their needs if they can disappear Mikheyev's hit (not automatic, of course).
If he wants too much, they'll have to let him walk regardless. I wouldn't reference the WOWY numbers with any degree of seriousness though, considering he had essentially no real playing time without Garland on his line (it's like 30 minutes there, likely displaced randomly over several games, several of which were with Beauvillier).
The shooting percentage is more concerning and will regress (though FWIW, his expected shooting percentage was highest on the team, likely from taking most of his shots in close to the net). But even if comes down to a 10 goal, 30 ES point pace, that's still quite easily worth $3M AAV given the other factors he brings (size, PKing).
If he wants something approaching $4M or more, it's a tougher justification.