Also, Drew Bledsoe is quite capable of taking a team that was .600 the previous season, then lost the first two games, all the way to the Super Bowl--if that team's defense is lead by Bill Belichick. Heck, Bledsoe even played most of the 2001 AFCCG and lead the team to a win that day too!
Bledsoe sucked in that AFCCG. He completed under 50% of his passes including 7-18 in the 2nd half. The Patriots won the game with 2 special teams touchdowns and an epic 4th quarter mental breakdown by Kordell Stewart (from which he never recovered).
You don't seem to have any clue how rare it is for a quarterback, any quarterback, to be successful in the postseason. Never mind the kind of sustained success Brady has had.
For example, Bledsoe, absolute garbage in the postseason: 7 games (6 starts), 3-3, 6 TD's, 12 INT's, 190 Y/G, 51.2%, 54.9 passer rating. The only season he had a deep postseason run, 1996, he threw 7 picks and was a pitiful disaster in the Super Bowl. Anyone who actually believes Bledsoe would have gone on to win any Super Bowls in NE had he remained the starter is totally deranged. That Belichick stuck with Brady in 2001 and beyond is the easiest decision he's ever made.
More "great" quarterbacks who routinely stunk it up in the postseason...
Brett Favre... how many backbreaking picks did he have in the postseason? Far too many to mention. Let's just summarize it like this... in his 11 postseason losses, he threw 25 picks. 25!
Jim Kelly... generally a bad postseason QB but those 4 Super Bowls that Buffalo lost in a row, look no further than: 4 games, 2 TD's, 7 INT's & 3 fumbles lost.
Dan Marino... the best pure passer ever imo but he was not a good playoff quarterback. 8-10 record, 24 INT's, 77.1 passer rating. He got particularly bad during the backend of his career, throwing only 5 TD's with 10 INT's in his last 6 games (2-4 record). He of course never won a Super Bowl, which may be the greatest underachievement in the history of the league.
John Elway... sneaky not so great QB in the postseason. Had 18 INT's in his first 14 postseason games. 2-3 in Super Bowls, the first win was all Terrell Davis (30-157 & 3 TD's), Elway had a 51.9 passer rating. The three Super Bowl losses, Elway was terrible (combined 2 TD's & 6 INT's).
Peyton Manning... for all his regular season greatness he was a postseason boob. Just sticking with the two postseasons he got rings... 2006, 4 games, 3 TD's, 7 INT's, 70.5 passer rating. 2015, 3 games, 2 TD's, 1 INT, 179.7 Y/G, 75.4 passer rating. He also somehow managed to fumble 8 times (losing 5) in his last 8 postseason games.
Roethlisberger... ok he's got two rings but he had a 22.6 passer rating in the first win and overall 3 TD's and 5 INT's in three SB appearances. He also has a whopping 31 turnovers in 22 postseason games.
That's the tip of the iceberg. Really what Brady has accomplished in the postseason is mindboggling. The only two quarterbacks you can even whisper in the same conversation with Brady, in terms of postseason success, are Montana and Bradshaw. But even still, Brady is now lapping those two as well.