Ohtani had 9 fWAR last season and only pitched half the year.
Bo and Vlad combined for 4.8 fWAR.
Ohtani is a unicorn. Just because they willing to open up the books for Ohtani doesn't mean they can or will spend like that on Bo/Vlad, and they shouldn't
Also, the scuttlebutt is that Bo wants to go to free agency anyways unless they overpay him ridiculously, and Vlad probably wants way too much for what has been dwindling performance for an overweight first baseman.