^Agree. The fact that he didn't "get rid" of Maya is a major plot point that ultimately caused the Honorspren to at least consider siding with humans again.
That said, other than the obvious signs that Maya is slowly waking up, there was this little tidbit in a Vyre interlude:
“I saw Prince Adolin throw his Blade,” Vyre said. “Three months ago, on the battlefield in northern Jah Keved. He is no Radiant, yet his Blade responds to him as if he were one.…”
“Maybe it was just a lucky throw.”
Vyre threw his Blade again. It clanged uselessly off his target. He narrowed his eyes, then dismissed it into a puff of mist.
“No,” Vyre said. “He must be able to change the balance to allow for this maneuver. And it returned to him faster than ten heartbeats, even accounting for the accelerated pulse of battle.”
That to me says that he's able to change certain things about Maya in blade form somehow, no? And we already knew about the less than 10 heartbeats thing.