Over a $20m salary is a star's salary. So yes, it is exactly#1 starter money.
Look I wanted Corbin, but giving a 30 year old a 6 year deal for over $20m a year would have been a recipe for disaster. Just because he grew up in upstate NY, does not prepare him for the bright lights of NYC pressure. Pitcher coming off of a career year in his walk year, pitching in a small market team jumps to the Yankees who overpaid him. Haven't we seen this movie before? Don't we know just how it turns out?
I'll address the last part first. Normally, I'd totally agree with you if not for two things.
1. He's a lefty in Yankee stadium. Lefties usually fare better than righties in Yankee stadium, as the short porch in right can really hurt right handed pitchers who tendencies to have a higher fly ball than ground ball percentage which leads me into my second point...
2. His pitch selection changed DRASTICALLY this season. He threw the highest number of sliders and curves in his career, decreasing his 4-seam and changeup percentage and not so coincidentally, his ground ball percentage shot through the roof and his fly ball percentage and homeruns went down and he had his best year.
So yes, I ALWAYS worry about the NL to AL jump, especially the AL East which has nothing but hitters parks, but all of that combined with the fact that he's a lefty, it could have given the Yankees a very good #2 or even #3 if Paxton outperforms him.
As for the salaries, $23 million is not #1 pitcher money anymore. What other #1 starters that have gotten to their free agent deals or were given extensions to avoid free agency are making only $20 million?
Here's salary figures for top of the line starters now...
Kershaw - $33 million/year (signed in 2018)
Greinke - $34.42 million/year (signed in 2016)
Scherzer - $30 million/year (signed in 2015)
Price - $31 million/year (signed in 2016)
Here's salary figures for top of the line starters years ago...
Verlander - $21.95 million/year (signed in 2010)
Sabathia - $23 million/year (signed in 2008)
Corbin got $23.3 million a year from the Nationals. That was Sabathia's figure back in 2008. Verlander got $21.95 back in 2010. Times have changed and salaries have shot through the roof in MLB. The elite top of the line starters are all getting $30+ million a year. The #2's will all get around $20 million a year or so now.
I don't like it, but these are the facts.
Edit: Just think about what DeGrom is going to get. It'll be above $30 million. Same for Kluber and Bumgarner.
The interesting one to watch would be Cole. I think he's more of a Corbin comparable and he'll probably get mid to upper 20's.