You guys might be able to better glean from Yzerman's comments than me and it's just general impression he's giving but he seems to be confident about Edvinsson's progress. I remember he was a bit more reserved and cautious on Seider's development, atleast before his SHL stint. Just an observation.
I think he felt cautious about Seider because we had no one to play with him at the time. He is less cautious about Edvinsson because we have legit NHL players to not only play with him, but also protect his ability to develop and not have to rush him into a top 2/4 pairing in his first year. He can develop with 16-18 min/night and not feel like he has to carry the team. But if he earns a top 2/4 pairing, then we simply shift Maata/Chiarot.
If Edvinsson earns the spot, Yzerman has said he will make the appropriate moves (trades/waivers) to keep the player.