VC low contrast filtration with MGIV produces two areas of lower contrast. Or, if you will, three areas of higher contrast.
The earliest Ilford VC papers from the 1930's attempted contrast control with hard and soft emulsions. This approach has all sorts of problems: the two emulsions develop at different rates, one is warm and the other cold tone, they don't tone at the same rate....
Ilford soon gave up this approach and adopted the Defender system - better known as Dupont Varigam. This system uses emulsions with the same intrinsic contrast and properties and has been the basis for all VC paper for the past 70+ years (at least in the US; Ilford may have kept it's original method longer). The emulsions aren't perfect matches (well, they can't be with the addition of sensitizer to some of them) and VC paper continues to split tone slightly.