Burvol
Bullbuck
From the sounds of it I think those trees are holding each other up.
If it was opened up too much I can see the rest of the stand suffering from wind throw. He must be in a warmer climate, as I can see a stand like this succumbing to snow press.
Were it my woodlot, I'd get a herbicide gun and shoot at least 30% of the less dominant stems and shoot another 30% 3-5 years later.
That would lead to alot of dead stems and a fire hazard, but what pine bush isn't a fire hazard?
Gypo
Holding eachother up? That's the age to define domnance. Wind develops strong roots at that age, not later in life. When you take out a stand and leave holes in it a more mature age is when blow down occurrs, not at this age. Conifers need to compete to a certain age. A powersaw or machine is better in these kinds of stands vs. herbicide.