That didn't really answer my question? You don't seem to think McCann is good enough for this role and he's a whatever. I'm not sure what to say to that.
Here's the roster as I see it right now:
Jared McCann - Auston Matthews - William Nylander
_______ - John Tavares - Mitch Marner
_______ - _______ - Ilya Mikheyev
Wayne Simmonds - _______ - Jason Spezza
Like Kerfoot, McCann is a much better winger than he is a centre. They are both "whatever" at that position.
Putting them at C also opens up a LW slot in the top-6, which is a big hole to fill.
Who is this great 3rd line center that will make everything better.
I hate Alex Wennberg, but at least he's a real center.
Nick Bonino isn't ideal, but again, at least he's a real centre. Same goes for Casey Cizikas and Brandon Sutter.
Luke Glendening and Sean Kuraly are probably 4th liners... but they're better centers than McCann. Same for Riley Sheahan.
Tomas Nosek and Derick Brassard would be good bargain options.
Mikael Granlund is probably too expensive, but he'd be a really nice option.
That leaves my top choice - Erik Haula. He's the ultimate utility player, since he's good at everything, but not great at anything.