More like a question than an idea for developers. Especially on higher difficulties it would be a proper carnage if 4 or more brothers got engaged as those have more enemies and less of support so instead of giving us more buffs, they could allow us to fight in greater numbers.

Man, I have hope. I imagine Horde mode as epic battle on big open map vs countless of enemies running at you with two goals: drinking your blood and eating your flesh. 

All you have on your side to withstand this challenge is squad of 6 or more battlebrothers standing united on fortified position and defending it at all cost in the name of The Emperor and for glory of their Chapters. 

We already have PvP, where there are 12 players on map.

We already have big open sections in PvE, so making bigger arena should be no problem. 

Add some ordeals on top of this. Add challenges around Horde mode and performance of you and/or squad in it. Add timer and give us rest of Survivors armor for surviving 60 minutes or I don't know, 30 minutes but on maximum difficulty. 

THERE IS SO MUCH POTENTIAL IN THIS HORDE MODE.

...but I have feeling what we will get won't be even close. Even after they fix it half year later...

:(