Hmm...Will Young is a member of the SteveNZ All Stars, I like him as a player and have been very vocal in saying they've dicked around his talent. But I feel like you've manipulated his recent stats a bit to suit the narrative.
His last 9 ODI scores (I picked 9 because that's what cricinfo gives me as recent matches, he did have an 87 in Pakistan before that) are 0, 12, 70, 0, 58, 24, 12, 33 and 29. That's an average of 26. His strike rate is 76 during that time, and I will grant that it is slightly affected by the Bangladesh dunger pitches. But he's still doing the thing he did as a FC player, which is not convert starts effectively.
To me, that isn't near enough to hold off a guy who just scored a big unbeaten match-winning hundred, and nearly another one before that, at much better than a run a ball. When you figure in that this guy adds to the bowling mix and potentially positively affects team balance, I just don't see how it's disputable that Rachin is the guy now.
Young would still be the guy if he'd converted some of those 70s and 80s into tons. He has 5 scores between 70 and 87 in the past six months.