A lot of really great stuff here! I especially want to see Smyly move towards a real slider. Like you pointed out his death knell last year was the reverse splits. I'd love for him to get back to getting lefties out even if he gave back some of his ability to handle righties. Having a lefty long man that we could piggyback with Taillon would be pretty savvy IMO.
One thing I'm trying to be very mindful of this year though is not buying too much into any pitch design stuff. I think the Taillon sweeper saga was my "fool me twice, shame on me" moment. When this stuff was newer there was a ton of low hanging fruit and the success rate was extraordinarily high. But now that it's been a few years I think we've reached the "there's no free lunch" zone. Guys will obviously make changes and level up, but I need to see it in real games before I buy in too hard.
Either way, I don't love Smyly getting another shot at the rotation. I'm not as down on him as most, but I think in order to forego leaving a lane open for Wicks/Brown/Assad I would need someone who has a reasonable shot of throwing up 3 WAR. If Jed wants to do a late trade for Bieber or Luzardo cool, but we don't need Smyly in the rotation, don't need to sign a Hyun Jin Ryu, etc. There were scenarios where Jed purged some pitching depth in trade where a vet #5 starter made sense (e.g. Soto), but it looks like we're past the possibility of anything like that happening.