"Other contenders?" Lol, wtf does that even mean? He beat everyone the UFC put in front of him, and the guys he beat were better fighters than the guys beaten by Aldo's other challengers. Pretty simple concept here, but you're really gonna make me post all the info and make you look stupid, aren't you?
Lamas - Grice, Swanson, Hioki, Koch
Mendes (1st time) - Omigawa, Rani Yahya
Mendes (2nd time) - Cody F'in McKenzie, Meza, Elkins, Guida and Lentz
Hominick - Caraway, Jabouin, Garcia, Roop
Florian - Nunes
KZ - Garcia, Hominick, Poirier
Frankie - coming off two LOSSES to Bendo
Conor - Brimage, Holloway, Brandao, Poirier, Siver
Even without including Mendes on Conor's list, his is easily the strongest. Some of Aldo's opponents had only beaten one guy to get there or were flat out coming off of losses. The other good list is Lamas', but Conor's is still better. Also keep in mind he didn't even have to take the Siver fight but he wanted to stay busy. Had he not taken it, all of you haters would be screaming "he ducked Siver!"