I do not think that the intermeshing helicopter can be equated with the coaxial when discussing induced velocity. Many of the Russian coaxials were intended for shipboard operations and therefore a small 'footprint' was advantageous. The Kaman intermeshing helicopters were promoted based on their low disk loading.
1/ The Huskie has a 23.5' radius and a 3.7' stagger. Its combined disk area is exactly 10% greater then the area of its individual disks. This represents a 10% improvement over a comparable coaxial or 4-bladed single rotor disk.
2/ The tip path of the upper blade when at 90-degree azimuth is 9'-8" above the plane of the lower blade. This is a much greater gap then a coaxial has and therefor the convergence of the upper rotor's downwash will put even more of the lower retreating blade in free air.
3/ The outer portion of the retreating blade imparts the greatest (blade element) lift and this is the portion of the blade that is operating in free air.
If the payload of a helicopter is 50% of its gross weight, then the above represents at the very least a 20% increase in payload.
Conversely, for future faster intermeshing helicopters, the total disk area and rotor drag can be proportionately smaller for a given thrust.