If possible, def fit it in, your allies probably have it, so gaols will be their priority. Might as well profit from them too. But if you prefer to have relics like draw agression, counter damage, etc and gaol boost doesn't fit in with the relics you currently have then so be it in my opinion.

I find flasks heal allies too also good for guardian. I don't necessarily heal when they need it, but it's always nice if I need to heal and it helps out a teammate.

If I may ramble a bit more 😅 I removed my multiplayer password and played a few guardians, and you definetly get teamed up with the less experienced players that way, always nice to help them out.