Well, in X2 at least we know that Stryker can control mutants with that serum or whatever he dosed Mags, Cyke, Nightcrawler and Deathstrike with, but I doubt he'd have it available in 1973. And it also doesn't explain why he would send Mystique in disguise to pick him up, rather than doing so himself.
I'd just rather that it actually have been Stryker himself who "rescued" Logan. It would have been a good way to set up Weapon X.