I'm still struggling with Bieber being a particularly good target. He's basically Stroman redux in terms of general profile and productivity expectations, and I'd hope for a SP better than that being acquired. With only 1 year to FA, if you pair him with Glasnow you're creating quite the post-2024 cliff in the rotation(Glasnow, Bieber, Hendricks), and the other better SP options(Yamamoto, Cease, etc) are much harder to pull off.
A mega deal for all 3 Guardians + Yamamoto & Hoskins is probably the best case scenario in that permutation? You'd take a chunk out of the farm and probably Morel, but you've added Bellinger's QO pick(and not signed any QO FA) to reinforce, and have another potential QO guy in Bieber next year if he pitches well. You probably have to punt 3B with incumbents or Rios-level pickups, but Naylor + Hoskins is a good bit of offensive depth and Yamamoto + Bieber + Clase is a huge shot in the arm of the pitching staff.