They wouldn't just switch Swinton and McMahon, given Swinton has been used quite a lot at the front of the lineout, and I can't recall that McMahon was used much there. If they did, they'd be more likely to put Wilson at 8 who is more of a lineout operator (I think).
I'd see McMahon and Samu as more comparable types in terms of where they'd fit.
I'd see McMahon and Samu as more comparable types in terms of where they'd fit.