So your premise is that he's just mailing it in and that's why his sprint speed isn't as fast? He only 'cares' enough to go at like 75% speed?
You might want to sit down for this.
It's kind of crazy, but people have been known to half-ass things in their professional life.
There's even multiple examples of such in professional hockey!
Now, as to why EP is playing uninspired is completely up in the air. I'm of the opinion it is mental health related and I wonder how much slack he'd be given if his last name was Rypien and/or he was a 'character' guy.
If you're dealing with a severe mental illness it can be very hard to do even the most basic things, so yeah, it could be entirely possible he's 'mailing it in.' But again, the reason why could be any number of things (mental health, lazy/unmotivated player, voodoo hex, aliens replaced him with a clone, or a longterm nagging injury no one has talked about or discussed and has been dragging him down for a year+...sorry, I know I'm kind veering into the fantastical here...)
Something is up with him, but unless he talks, there is no way of knowing what it is.