Was Mayo a prem regular? No. Bruno was a la liga regular, at one of the top sides. He's quite obviously the better player, so it's worth giving him the games to get his form back at this stage in the season.
Which player used to play regularly against the likes of Messi?
Form wise Calde might've been better over the past season but ability wise there is a massive gulf between them.
Calde was poor by his standards yesterday.
Bruno is coming slowly back to form, and is about 10x times the player Calde is, ability wise. Each of their histories bears this out.