Beneficial to use two stacked up sacrifice branches?

[Scrogdor]

I have a Korean Hornbeam with two close proximity established branches that are around a previous large branch cut off (received it this way). I was going to keep one around to continue to thicken the base.

But is it beneficial to keep both? One? Or neither of them? Sacrifice branches still confuse me a little because they only seem to buldge the area around them but I read that they thicken everything below them? Here’s a picture

Currently I’m leaving these since they have a large chunk of the existing foliage on the tree to keep it strong.

 

[Shibui]

But is it beneficial to keep both? One? Or neither of them? Sacrifice branches still confuse me a little because they only seem to buldge the area around them but I read that they thicken everything below them? Here’s a picture

Sacrifice branches definitely thicken everything below but it takes time and occasionally a tree will just be perverse and not grow as most do.
Bulging is common after removing sacrifice branches. As the wound heals the callus thickens more than surrounding tissue. Correct pruning helps reduce the severity.
I no longer allow new shoots to grow around cuts healing over. They seem to make the problem worse far more often than doing good.
Those shoots are very, very low on the trunk so there's not much opportunity for them to help with trunk taper. That low the lateral roots are going to do far more than a sacrifice branch IMHO.
I'd be getting rid of those 2 but as you mention they constitute a large proportion of total foliage best to leave them until the top starts growing more.