I see it the same way as you do, but I don't see the gaps to be as significant. I did see a lot of Foote being on the West Coast, but I just don't see Stevens during that time period being twice the player Foote was. He was better, but it wasn't night and day, IMO.
Konstantinov, had he played out his career, could have been better than Foote (especially considering how much he scored in a shut down role), and probably gotten close to the level of shut-down Stevens. But he'd never be the complete defenseman Stevens was prior to 94/95, which would hurt him in an all-time ranking.