They'd most likely be an H-SLE/C-IEI duality. The SLE would be withdrawn and grumpy, and the IEI flighty, fantasy-driven and idealistic, in a manner that the SLE finds wonderfully amusing and inspiring. They'd have this GRAND GLORIOUS AWESOME VISION, which would inspire the SLE, possibly enough to shake them out of their torpor and say LET'S DO IT! (integration into 3), at which point they'd take point.