Tua is the starter in 2021and free agency/draft should and will be used to build the offense up around him. Tua didn't light the world on fire, but he played like a rookie quarterback and he didn't really do that bad. In fact his rookie season was far better than Josh Allen's rookie year.
Idk if Fitzpatrick comes back, but if he does, it will be as Tua's backup. If not him, I would pick up another veteran to be his backup, especially when this is a team that is going to be in the playoff race next year also. If Tua gets hurt it is hard to turn it over to a mid-late round rookie. A quarterback will not be drafted in the first few rounds, I understand that will be an offseason storyline that some will try to keep inventing and pushing, but it is not factual.
This offseason is not about replacing the quarterback, they got the quarterback last draft. It is about adding more firepower for Tua.