Yes, it was “figured out”. Belichick found the weakness in the coverage and exploited it. Brady wasn’t the greatest of all time in his second season or third or fourth. It really wasn’t until Cowher was on his way out that Brady was considered to be 1b with Manning, around the time he got Welker and Moss
No, thats not how it works.
Yes, Lebeaus defense was figured out. But that was before Brady was even in college. The difference was the two factors listed above.
1. Knowing before hand the exact play. Which completely neuters the main scheme advantage of zone blitzing.
2. The best QB of all time whos best attributes are processing and accuracy. The two qualities you would give a QB going up against that scheme.
Its not that complicated. It wasnt some crazy puzzle offense couldnt figure out. Its a system built to put pressure on the QB both physically but more important mentally. To beat it you have to figure which guys are coming and which are dropping quickly and by the time most QBs can do that the physical pressure is there and its too late.
Brady is great at processing the play and getting the ball in and out of his hands.
It also help when you know the play call, eliminating the mental pressure portion.
Cheating and also having the best QB ever isnt some kind of knock on the defensive scheme.