If Arsenal sign Rodrygo and Gyokeres Arsenal is going to be a tough opponent to play against, Arsenal are currently working on Gyokeres deal before signing Rodrygo as Real Madrid is still in the Club World Cup, according to the news Xabi Alonso and Real Madrid have given green light of letting Rodrygo leave but Xabi Alonso always said Rodrygo is very important in his squad and he is doing everything to make the player have a good season but due to lack of minutes Rodrygo need to leave Real Madrid because he is a star player and as a Real Madrid fan I prefer Rodrygo over Vinicius because since the Balloon Dior issue Vinicius has not been good enough to help the team.
Rodrygo is a star player who is good with attacks and also is ready to contribute for defense proactively. He surely is useful for many head coaches and it's not surprising if Xabi Alonso intends to keep Rodrygo in Real Madrid. I really disagree with you about Vinicius and Rodrgo comparison, because in the last season, Vinicius still had better performances than Rodrygo had. This fact is shown from two players' stats and I am unsure how did you make this conclusion that Rodrygo played better than Vinicius.
Having Rodrygo, Gyokeres and Saka as attackers is going to be a huge improvement for Arsenal because Trossard and Martinelli are not good enough to help Arsenal on the left wing, and Arsenal are giving Rodrygo full assurance that he will be in the first eleven, which is what Rodrygo wants. From my observation, I think Rodrygo and Gyokeres to Arsenal is just a matter of time because everything is going well.
They can combine and make a very powerful attacking system for Arsenal but in theory only. In practice, we only need to see they play together, not only one but in many matches before conclude their combination quality and performances for Arsenal. They are all good attacking players but how they combine together is unknown.