Fully inflated balls wouldn't have changed the outcome of the AFC Championship game ... the Pats still would've won BIG ... so says someone who was there, Colts linebacker Erik Walden.
Walden -- who racked up 5 tackles in that game -- says it's "gross" that Brady would resort to cheating ... but says, "I don't think that s**t made a difference in our game."
For the record, the Pats beat the Colts 45-7.
"They're already hard to beat and now we know they do that extra s**t to win. They're coming at you from every angle."
Walden added, "It's unfortunate that they did this, but they're still the champs. You gotta give them credit, they did it, and they got away with it, and they won the Super Bowl."
"At the end of the day, you still gotta play the game ... and in our game, it wouldn't have mattered if we were playing with a frisbee. They whupped us. They always find a way to win."