probably Garo Retsuden is the the most intriguing preview. as we only know the 1 word title for next episode, but we also never know which chara will get the focus in next episode.
back to ex-aid, yes most of the preview kill the mood i think.
even in Gaim when Kouta supposed to die bcoz of michy, the preview ruin it as well.
idk, does TOEI really do it bcoz they just help the audience too much????
otw: Ex-Aid , Hurricane (ep3), Amazons S2, Kyuuranger
KR: Black, RX, Super1 + all Heisei + AMAZONS
Garo: All (anime[both] as well)