Yes, of course we might end up playing with 7, but starting with 7 or starting with 3 OT's is another matter.
If Simmons is healthy and we bring back Britt, we will have our insurance policies. We can then see if Wendell or Connolly make it to the Practice Squad as I expect they will. If they are good enough, they should be paid full roster salary as Yates was in the past.
For me, these two changes would be a significant improvement over the initial roster with little downside. Since we had 9 OL's on the initial roster, no other units are even affected.
And just BTW, I think that Britt is a better choice than O'Callaghan since he is a better LT.