As someone who has served on the Mr. Football/Mr.-Miss Basketball committees and several of the all-state committees in a variety of sports, let me see if I can help temper the conversation a bit.
The TSWA selects a very dilligent list of athletes in ALL football classes. Each member of the committee gathers nominees WITH STATS from each his/her area. In many cases, the nominees are discussed via email/phone or in person before the all-state meeting. Usually a dozen sports writers are at the meeting and it is usally a good mix of people from all three grand divisions. Kingsport, Chattanooga, Knoxville, Nashville, Clarksville, South-Central Tennessee, Memphis, Jackson and rural West Tennessee is often well represented and all nominations are scrutinized carefully. I can recall when we knew of an athlete who wasn't on the list and the sports writer wasn't at the meeting, we called him at 1 a.m. to get the info just to make sure we had the best all-state team we could. Every nominee is considered and gets fair assessment. And it's done for all five public classes and each private class. The TSWA prides itself on its all-state teams. There are placements for each position on the field in addition to some auxilary spots, often known as "athlete." It really is done quite well and the state should be proud that it has good people on the committees (people like Mo Patton, Steve Hargis, Chuck Morris, Mike Hutchens and others) who feel it important enough to make every meeting, whether they have a team in the state finals or not.
As for Mr. Football, coaches and media nominate via fax/email/regular mail. Those nominations are tabulated and presented to a committee of sports writers. Those writers also keep track of players in their area and ask for help from other media in their region. The sports writers come from every grand division and from each splintered area from each grand division (like Tri-Cities, Knox area, Chattanooga area, Nashville, Murfreesboro, Gallatin, rural West Tennessee, Jackson, Memphis). It is a top-notch committee. There is discussion for athletes in each class, then the members vote for first, second and third place. First place gets three points and so on. The one with the highest votes is Mr. Football (or whatever sport). But before the person is awarded, the TSSAA makes a call to each school, often referred to as the "Hooligan Call," to see if the kid is worthy or a hooligan. If the kid gets the thumbs up from his school principal/director, he is awarded. There was an instance where a kid, who was voted Mr. Football and signed with a major D-1 school, didn't pass muster, so the award was rescinded. The TSSAA had to go back to find a high-balloted nominee for the third slot, who wouldn't have gotten the runner-up award in the first place. So there are backstops. Each grand division is well balanced to avoid an imbalance of the award distribution. Yes, each year, there is controversy, but the Mr. Football awards are done as well as the TSWA all-state ballots...and many of the same committee members are on both.
As for TFCA and AP, I don't know how they compile their lists, so I can't speak cogently about that. But TSWA does offer all-state lists for each class and every opportunity is afforded those to get their submissions in, even if it means a phone call at 0-dark-30 two minutes before the vote. One last thing, often those meetings take several hours and every committee member gets a say. It really is done quite well. I hope this clears up the process and the listing by TSWA and Mr. Football.
Merry Christmas, Happy Hannukah, Happy Kwanzaa, et. al. to all.