Agree wholeheartedly. I did every single one of the gauntlet levels up through AA that weren't Gunner/Warrior with all sentinel teams while still completing the talisman challenges. Mathematically we should be fine if a few others did the same as each member of a full clan would only need to do on average just under seven battles with Sentinel teams.

However I doubt my clan will complete that challenge or the Chance Talismans as those don't easily drop (at least in my experience) and we only have so many Gauntlet battles and even less where we can get away with substandard team set ups.

All the other challenges could be completed by a handful of members doing the repetitive work. I just don't see that happening now that we also have an annoyingly grindy cosmos event on top of that.