I didn't watch the game (although I saw parts of the 2nd half on that website).
The interception by Shazier was impressive. Very athletic. If you scout that, you perk up a bit. No doubt about that.
I try not to read too much into the tackle stats. The Bills ran 45 offensive plays in the first half. That's A LOT. Hopefully we don't allow a team to run that many 1st half plays the rest of the year. The Bills ran 18 times for 64 yards, which isn't bad for a 1st half.
Of Shazier's 7 tackles on defense only ONE would be considered a "defensive stop/success". Here they are:
3rd and 2 - Pass for 4 yards (Shazier tackle) - Offensive win
1st and 10 - Run/Scramble for 5 yards (Shazier tackle) - Offensive win
2nd and 5 - Run for 2 yards (Shazier tackle) - Defensive win
3rd and 7 - Pass for 7 yards (Shazier tackle) - Offensive win
1st and 10 - Run for 4 yards (Shazier tackle) - Offensive win
1st and 10 - Pass for 5 years (Shazier/Timmons tackle) - Offensive win
2nd and 5 - Run for 4 yards (Shazier tackle) - Offensive win
So while I agree Shazier was "active", I'm not sure I consider a lot of what the defense was doing a super success. They did some nice things, but giving up 12 first downs, 5 of 9 3rd down chances and 212 yards to E. J. Manuel's offense isn't exactly something I'd brag about.
It's pre-season. I don't want to read too much into it, but not sure I agree with getting excited when a guy tackles somebody after a good play by the offense.
The interception was outstanding. No doubt we need more stuff like that for this defense.