Fair enough, I get your point now, but we are still talking rare circumstances. I challenge you to find just 1 example where a team went 0-3 outside their division and 5-1 or 6-0 inside their division.
The closest example I can think of is the year Wisconsin went 1-2 outside the division and 6-0 inside the division. And Wisconsin still won their division.
I'm not going to search for it and I'll concede that it might not exist . . . yet. However, as we progress further and further from the old days where each team in the nine-member ACC played all the others and each team in the 10-member BigTen and SEC played all but one of the others the phrases "BigTen/Big11Ten/B1G schedule", "ACC schedule", and "SEC schedule" become less meaningful.
Years ago you pretty much knew who those teams played without having to look it up because they played almost everybody. When the SEC adds OU and UT to get to 16 members then plays an eight-game schedule my position is that the phrase "SEC schedule" will be nearly meaningless. Each of the 16 teams will be playing barely over half of the other teams. There will be years in which a specific SEC team plays a brutal schedule that includes nearly all of the best teams and other years in which a specific SEC team gets off pretty lightly because they manage to duck nearly all of the best teams.
For a more current example, here is my usual schedule/performance chart:

As you can see, I've
bolded the crossover games and put them in boxes. Penn State has the toughest schedule in the league because they play in the tougher division AND they play the two toughest teams in the other division. Conversely, Iowa plays in the weaker division and two of their three cross-over games are against two of the three weakest teams in the other division. Now look at the impact:
Against the top-5 teams in the league:
- Penn State has four games, three on the road.
- Iowa has one game, at home.
Against the top-9 teams in the league:
- Penn State has eight games, five on the road.
- Iowa has four games, two on the road.
Against the bottom-5 teams in the league:
- Penn State has one home game.
- Iowa has five games, two on the road.
Penn State and Iowa appear to be very good teams so lets ignore HFA (for the sake of this example only) and assume that they are 50/50 against the top-5, 75% against the middle-four, and 80% against the bottom-5:
Iowa:
- ONE game against the top-5: 0.5-0.5
- three games against the middle-4: 2.25-0.75
- FIVE games against the bottom-5: 4-1
- Total: 6.75-2.25
Penn State:
- FOUR games against the top-5: 2-2
- four games against the middle-4, 3-1
- ONE game against the bottom-5: 0.8-0.2
- Total: 5.8-3.2
That is only about a one-game difference but if they both avoid upsets against the bottom feeders it moves to:
- 7.75-1.25 Iowa
- 6-3 Penn State
Now it is almost a two-game difference and Iowa at 7-2 or 8-1 is at least a contender for the B1GCG while PSU at 6-3 is probably an also-ran.