Well of course beachhead is a military strategy. In this episode we see a little of the lengths that the Ori are willing to go to for their strategy.
Allying with the Go'auld
Using the Jafar and SGC weapons to power their shield.
Causing distrust with the Jafar and SGC.
I think even though the Ori did not establish their gate they dove into plan B the divide and conquer strategy.
The distruct between the former Go'auld's and jafar and SGC mean no moreteam work to get rid of the bad enemy. It took all three working together to get rid of the replicators. I Ori did not want to repeat that mistake.
This was an important episode.