The Hotline mailbag publishes weekly. Send questions to  wilnerhotline@bayareanewsgroup.com  and include “mailbag” in the subject line. Or hit me on the social media platform X: @ WilnerHotline . Some questions have been edited for clarity and brevity. What should we make of the coaches backing the 24-team playoff? And how many teams does the Group of Six get in that format? — H Hughes Postseason expansion dominated much of April and is doing the same with the first half of May. The same week the NCAA tournament formally (and unfortunately) became a 76-team event, the College Football Playoff took an unofficial but significant step toward doubling in size. The American Football Coaches Association (AFCA) voted in favor of a 24-team field, the elimination of conference championship games and ending the CFP earlier in January, according to a Yahoo report Tuesday.…