I'm curios how many times a year are champions required to defend there belts
since some are only defending one time a year creating back ups in there divisions
because a good example being Jacare Souza who has been a top five fighter
for at least 2 years and no title shot even when he has run off wins in a row.
Cormier last defended the Heavyweight title 6 months and 20 days ago, and will next fight at UFC 241 (9 months, 15 days between title defenses).
Jones last defended the Light Heavyweight title 2 months and 21 days ago, and will next fight at UFC 239 (4 month, 5 days between title defenses).
Whittaker last fought at Middleweight 11 months and 14 days ago, and wants to fight next in August (14 months between fights).
Usman won the Welterweight title 2 months and 21 days ago, and wants to fight next at the end of the year, possibly November/December (9-10 months before first title defense).
Nurmagomedov last defended the Lightweight title 7 months and 17 days ago, and wants to fight at UFC 242 (11 months, 2 days between title defenses).
Holloway last defended the Featherweight title 5 months and 15 days ago, and will next fight at UFC 240 (7 months, 20 days between title defenses).
Dillashaw vacated the Bantamweight title 2 months and 3 days ago; Cejudo and Moraes will fight for the vacant title at UFC 238 (2 months, 20 days between title fights).
The only champion exceeding one year between fights is Whittaker and that's due to injury.
As for Souza, he lost against Romero in 2015, won against old Belfort and Boetsch, then lost against Whittaker, and hasn't had a win streak since. If he hadn't lost against Whittaker he would've been fighting for the title instead of Whittaker, so that's on Souza, not the UFC.