Hoyber isn't putting any focus into Shadowburn on adds or timing AE. Big dick Warlock DPS comes from sniping adds in execute range (with Havoc up on boss) and timing Dark Soul cooldowns with AE phases. Adds die quick. Lots of classes do big AE and a lot of them can instantly start it.
For example, the hands on Kormrok, both Warlocks should be ready at the start of grasping with 4 embers and F&B up so you can get two AE Chaos Bolts into those packs. You don't prep like that, all those hands die without you doing shit to them. The Vid dude does 3 million damage to the hands. The other guy 700k. Add 2.3 million to Hoy's damage done and he actually ends up above the other guy. This is the only difference between the two on that fight. One guy timing an AE phase that lasts maybe 6 seconds and the other not.
On Gorefiend, Vid gets 26 executes off vs Hoy's 8 and neither of them are leveraging Havoc (which duplicates Shadowburn damage on the boss), but it's again a simple thing that just takes a little effort. Add the 2 million damage Hoy is missing out on skipping that and he's right up there with the other lock.
The one thing I would say though is this stuff, the AE/add focus...it's meter padding. One warlock missing out on a CB on the grasping hands neuters his overall DPS, but it's not like there is any threat whatsoever to those hands not getting blown up by everyone else. The Shadowburn is a bigger deal because you generate embers using it on adds (plus boss havoc damage), but even then the actual add damage is all happening on low HP mobs under 20%. Those are probably getting killed just fine by the rest of the raid anyway. The Hoy guy actually does more boss damage on Kormrok.
I think both of these guys are playing ok. Ultimately you want to see people push higher, because it means they're so comfortable with the fight/class/rotation they can focus on the extra things. The people capable of this are ultimately going to be better players, but the lower lock on these fights isn't hurting your team at all other than everyone just noticing he's so much lower, but it really is mostly on lower priority damage.