The grayish white bar is how many motes a team is currently holding that has yet to be banked. Look at the enemies bar and ensure your team banks to your 25 or 50 threshold (for invasion portal) with a blocker or two included when their gray bar is big. They get blocked, then you invade and make them lose that whole gray bar of motes. I get really pissed when we're close to 25 or 50 and they have a massive gray bar and none of my teammates have the sense to just throw theirs in to even get a quick small or medium blocker and open our portal. That is where you win games. Any time mid game they have a lot they're holding you need to bank to open that portal. It doesn't matter if it's a large blocker or not. Any good enough delay that allows your invader to go in with their bank locked is huge. Edit: to add to this during an enemies primeval phase don't immediately invade if possible. What until they take off some of its health and waste most of their good initial ammo and then invade and heal it back to 100 percent. Now they likely have less heavy and Super to use on it.