My repeated comments about him not pitching in 2018 are only in part because of the ankle surgery.free_mhayden said:
Anything can happen, but really not sure where you are getting this new angle that you don't think Ohtani will pitch much in the MLB in 2018 because of injury (rather than because of his stuff -- which I haven't seen any scout consider it any worse than a back-end-rotation guy).
His ankle surgery went as expected and rehab puts him ready to go by mid-January. This isn't arm or shoulder surgery that you need large chunks of time before you even start throwing and then half a season to truly be back to 100%.
If there are no significant setbacks, he may not be ready to go Opening Day, but he'll certainly be ready for the majority of the 2018 season.
If his ankle isn't well enough for him to pitch, it's probably not going to be well enough for him to hit either.
In 2017, he pitched 5GS for 25.1 IP. He had 19 BB.
His peak of 160.2 IP was in 2015.
By comparison... Darvish had 4 seasons of over 200 IP with his peak at 232.0 the year before he came to Texas.
Ohtani has ERAs of 4.23 (age 18), 2.61, 2.24, 1.86 & 3.20 (age 22)
Darvish had ERAs of 3.53 (age 18), 2.89, 1.82, 1.88, 1.73 (age 22), 1.78 & 1.44 (age 24).
Darvish then posted a 3.90 ERA with Texas.
Any logical minor league pitcher with the experience Ohtani has pitching... IMO, would not be slated to throw over about 140 IP in 2018. His limited pitching in 2017 would be similar to a rehab for an experienced MLB coming back.
The ankle issue, without knowing the details, just leads me to believe 120-130 IP is what you will get from him in 2018 and I would venture to guess his 1st 30-40 IP will be in the minors. He will likely get promoted for a few weeks and then return to the minors. Remember... Japanese pitchers are used to pitching once per week... not every 5 days.
He could require the signing team to have him on the Major League roster, but that would surprise me.
I could be wrong.