This is a fair point, and I think the comparison between BU and BGSU is very close. However, the biggest reasons why I think the committee considers BU a lock and BGSU is not is because (in no particular order):
(1) BU is an eastern team, and I just can't see the committee leaving BU out and putting BGSU in when there is a dearth of eastern teams in contention for the tournament as is.
(2) BU is a Hockey East team, and it is probably fair that, at minimum (fair or not), 3 HE teams will get in, and BU probably has the third best resume in Hockey East this season.
(3) BGSU is a WCHA team, and it is probably fair that, at maximum (fair or not), 3 WCHA teams will get in, and BGSU probably has the fourth best resume in WCHA this season.
(4) BU lost only 4 games...albeit in a drastically shortened season, with "quality" in-conference wins over BC and PC.
(5) BGSU lost 10 games...albeit playing almost a full season. However, BGSU went 1-7 against the WCHA's top 3.
Sigh...this is why I miss having objective criteria determine our field.
That being said, I do believe that when the tournament field is announced, there will be a big surprise or two getting in that will leave those of us trying to predict this thing scratching our heads.