The arb system doesn't quite work that way. Vlad is in his 3rd year of arb due to super 2 status while Bo would only be in his second year. while Bo has been the better player recently, Vlad's near MVP season still weighs heavily in his favour for comps and led to a high starting point as he entered arb. That would account for a quite large difference between what he would file at this year and what Bo would have filed at.