I would love to see the team split the division wins but the truest test is a possible third meeting between Dallas and Philadelphia in the postseason. There is a likelihood now the team will be 0-2 to the Eagles in the regular season. That said, it is not an impossibility for Dallas to do a New York Giants and win that third head-to-head when it matters most.
That capability is fully in Dallas' hands though but it also means the team must play better, more cohesive all-around football though. Offensive line blocking is one hurdle the team must improve upon despite what it has shown to be capable of to this point. Steele in particular.
It is the primary active roster area the front office should have addressed before the trade deadline--no matter how unlikely the prospects of successfully trading for a starting quality tackle were. That was the sole responsibility of Jerry Jones to make happen. To pull a rabbit out of a hat that did not exist. GM's review holes in a team, with coaches and scouts, and fill them. No one else.
Now, the team must succeed without that assistance. I hope that they do.