Brian Callahan is the first NFL head coach to get pink-slipped this season and chances are he’ll have some company in the unemployment line in the not-too-distant future.Last year three head coaches were fired midseason.With the Dolphins off to a 1-5 start, Miami’s Mike McDaniel has been the central figure in any coaching hot seat discussion this fall. The Dolphins find themselves answering questions again about their team culture following Tua Tagovailoa’s comments Sunday calling out unnamed teammates for being late to player-led meetings. Aaron Glenn, the hottest candidate in the 2024-25 coaching carousel cycle, is making rookie mistakes like letting the clock run out at halftime rather than try a Hail Mary and having Justin Fields drop back on fourth down from the Denver 44 rather than attempting a long go-ahead field goal in the closing minutes of the Jets’ 13-11 loss to the Broncos in London on Sunday.The Jets put up a franchise-worst minus-10 net yards passing as Fields completed just nine passes and got sacked nine times. The loss made Glenn the first Jets coach to begin his tenure with six losses. The Baltimore Ravens, the popular pick to represent the AFC in the Super Bowl, aren’t much better off at 1-5 with Lamar Jackson sidelined. Coach John Harbaugh, who’s won 187 NFL games, was catching flack from fans during the Ravens’ fourth consecutive loss Sunday, 17-3 to the Los Angeles Rams.The three head coaches who didn’t make it through the 2024 season were Robert Saleh (Jets, Week 5), Dennis Allen (Saints, Week 9) and Matt Eberflus (Bears, Week 14). Joining them in the unemployed ranks after the season in January were Jerod Mayo (Patriots), Antonio Pierce (Raiders), Doug Pederson (Jaguars) and Mike McCarthy (Cowboys).Here’s the twist: the three head coaches who were fired midseason last year had a combined record of 8-18. Their interim replacements finished a combined 7-18 in 2024 and their full-time replacements so far this season are a cumulative 4-13.In addition to Glenn (0-6), Kellen Moore is 1-5 in New Orleans. The only early success is from Ben Johnson (3-2) in Chicago, where the Bears have scored 20-plus points in their first five weeks …