Couple things.
1. I don't bank on anything. I do think Betts is a pipedream, but I also think he is like...the perfect fit....and if there is anyone the White Sox should shell out a mega contract offer for it, it should be him. Will they get him? Most likely not, but I wouldn't remove all doubt right now. Springer would be a pretty great consolation prize anyway.
2. I do not and will not factor Mazara into any plans after 2020. He is a 1 year roll of the dice. If he blossoms, he'll be here in 2021, but I am not counting on it, and neither should you.
3. Signing Castellanos absolutely blocks Vaughn. If not, the Sox are going to have the worst OF defense in the league with Eloy and Castellanos, even if they have an elite defender in Robert in between. We need to play better defense moving forward! Castellanos can fake RF for a year or so, but by 2021 he should be the full time DH, And so should Abreu.
4. If his market has cratered to the point to where like a 3 year $40-45M deal is possible, id consider it. But definitely would want nothing to do with a NTC, and I would be trading Castellanos most likely within 18 months. But I doubt his market has cratered that much.
Some of you guys just want to push all the chips in right away. Be patient. Castellanos would seriously handcuff this team positionally. Try to take the long view. Not to mention, EE will be cheaper, be a 1 year commitment, and is probably a better bat anyway.