Absolutely. And I am sure all those who said the idea of a Grand Clan Castle wouldn't work will find it extremely helpful should Supercell introduce it as a feature.
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Grand castle nice ideal. Down side a guy get ♥♥♥♥♥♥ at clan before he leaves in a blaze of disgrace for being demoted for being bad at war or something. What's to screw everyone in the clan by filling the grand castles full of goblins or wall breakers. Before they leave or get kicked.
As long as the troops have a use by time say 12-18 hours from time of donate. At that point they die off.
If all would donate to it good troops with indication of donated what. And someone not beagle to pull troops they donated to it. And can only remove from it only as many as they put in then. Fine I like it but those who keep asking for this will say all these thing lock them out from using it.
Because those guys are the one that never donate always want troops and always ask for Max level stuff and complain when you give them the same troop but a few levels lower which stood be fine. But instead they get get mad and call everyone names and leave during war with out using attacks.
OK I know I sound bitter but I got screwed many many times by guys who are just are not team players.
4th idea is not good as people would join a clan and take good troops and leave
If you're getting matched to TH10s in war and you're TH9, you're setting your wars up wrong. Higher walks n golems are not needed. you're already able to bring them up 2 level at TH9