Hmm? Do you mean picking a Friend Eidolon? If you pick the same Eidolon at +0 and +99, you have the exact same HP. So you only get the passive, not the stats.Explain?Practically true.
All Raid events use the same Tickets, it's just that the game wipes your Tickets (and Blue and Red orbs) the first time you enter the Raid event front screen. If you want to, you can save up Tickets from previous raids in your Gifts list - the ones from the "solo Rs only Expert" mission and "off-element Ragnarok" one, as well as the PP rewards. This is quite the bother since you won't be able to use "Take all Gifts" button for ages, though.
14. You can stack as many Damage Cuts as you want, plus one Hime Elemental Resistance, plus one Eidolon Elemental Resistance, plus one Reflect. If you reach 100% Damage Cut, everything will do 0 damage to you.
15. Taking 0 damage will still apply debuffs to you. Only "miss" will make you avoid debuffs.