I'm interested in what amplification Kiwi thinks does sound best with the MBLs. Back in accordance with my point that there is no "best", from what I've read their sound in general leans more towards the detailed and analytic side of things, so I could understand the preference for a hybrid design in that case.
Regarding the technical suitability of the Rowland/ICE, I think his review confirmed that the Rowland did take full control of the difficult to drive MBLS, which is what I would expect and even demand, he just had a few reservations about the resulting sound from his perspective. That is why technical fit of components is key, but that alone does not guarantee a match to tastes.
I've never actually heard MBLS, but from what I have read (a lot), they share a difficult to drive, power hungry load with the Ohms and a similar design to some extent, but I suspect the sound from the specialized omni driver array used is much different otherwise. The Ohm Walsh driver is also a unique design but not totally unlike a conventional dynamic design. I think Class D could work very well in the case of the Ohms and produce a sound that one can "warm up to". Tube amplification is right out with either Ohm or MBL I believe do to the difficult load and power consumption.