It's really complicated situation because Gyokeres really wanted Arsenal, not entirely sure what the exact reason was,
There are some reports that he's a lifelong Arsenal fan and apart from that, Arsenal has managed to get closer to the silverware in the past few seasons without having a real striker, so he knows he might be the missing piece.
the acquisition of Rodrygo or Eze will really put Arsenal on a better footing for the next season.
You have a point and despite knowing that Rodrygo is a level above Martinelli, I think he's going to have a hard time adapting to the physicality of the EPL, so I prefer Arsenal re-signing Eze instead
[recently there's been some rumors about the number 10 shirt being reserved for Eze, but we need to sell some players first].