In the group of six players I am GMing (all on level 1), there is a player using a summoner who chose his eidolon to look like a human. The result is, that he has a lot of stage time (once for the summoner, and then for the eidolon), and he also double-rolls many skills like Perception, Trap finding etc. for his character and his eidolon. Moreover, the player chose to tell the group that the eidolon is just a companion of the character, and not an eidolon. So he constantly tries to do the summoning and dismissal in secret, and conceals the summoner/eidolon "forehead rune." (I don't know why the player did that)
The other players are starting to be annoyed by this, and in my opinion rightfully so. What would you recommend me to tell the player, so he does not feel cut off, but the group would feel better as well?
I thought of something like "your eidolon cannot speak", "skill checks may only be made by the summoner OR the eidolon" etc. What are your suggestions to make the game flow better?