C1 Illuga or C6 Gorou

Hello!

I have a guaranteed linnea after losing 50/50. I wanted to ask if I should replace Illuga with someone else in Zibai's team.

My future team will be: C0 R0 Zibai, Linnea C0 R0, C2 R0 Columbina, and C1 Illuga.

From what I have gathered online, C2 or C6 Illuga is a great support for Zibai. But, C0 and C1 Illuga ain't that great.

Should I keep him in the team or replace him with C6 Gorou?

thanks!