An airlifter with four 5000kw engines only has about 30% more power than Y-9, I'm not sure if that'll directly translate to meaning the aircraft is only 30% larger with 30% bigger payload.
But if it does, I think this plane is more of a Y-9 replacement than a complement. I'd expect a payload of 30+ tons to act as a complement between Y-9 and Y-20 instead.
Blitz I am not sure Replace so much as supplant.
Here is what I mean, Way back yonder in the 1950's when Elvis was young and singing, Cars were Marilyn Monroe on the front and Rocket ships on the Rear with sizes equal to some zip codes, C130 and An12 ( the mother of Y8 and Grandmother of Y9) were at that time capable of carrying armored fighting vehicles of the time. The American M113 could be air dropped from a C130, AN12 could carry and drop BMD-1 ( although introduced in 1969)
As time as gone by the demands of combat have pushed most of the Armored vehicles of the world out of the lifting envelope of these families. most modern IFV's weigh in at the very edge of these vehicles weight requirements if not beyond it. For example the BMP-1 of 1969 was considered to heavy for the Soviet VDV Airborne it weighed in at only 14.6 tons so they created the BMD-1 at 9.1 tons fully loaded. The US M113 weighed in at 13.4 tons. now look at there modern equals. The BMP-3 is 20.6 tons the BMD4 is 15 tons the M113 is still in service but has a replacement program under way the most likely replacement is based on the Bradly fighting vehicle family which tips the scales at 30 tons.
C130 can never ever ever ever carry a Bradley fighting vehicle. even the latest J model cant do it.
in the same breath Y8 can't carry a modern PLA IFV either, Even the modernized Y9 can barely lift one but would not have much fuel.
So both the Chinese, the Russians and the US as well as europe and every one else then find them selves forced to make a choice they either sacrifice armor for mobility and introduce vehicles that are thin skinned yet can be carried by these older transports or Introduce massive fleets of heavy strategic transports. Thats not much of a choice is it?
There is a Third option though.
The Third option seems to be the model being used by both the US and PLA. You introduce first a interem medium to lightweight family of multifunction armored vehicles. the Stryker was originally billed in fact as a "Interim Armored Vehicle" we see something similar in the ZBL09.
further upgrade the legacy lifter C130J, Y9. and then introduce a heavier lifer at a later date. This model of a "New Intermediate Transport" has an American Equivalent program well actually two, in the
In Essence the requirements though are the same a 30-40 ton tactical lifter to move modern IFV's where needed with Short field take off and landing ( if not Heavy Lift Vertical Takeoff and Landing) superior to C17 ( or Y20 in the PLA's case) to allow Rapid deployment of maneuver forces.
But If you do that what do you do with C130J or Y9? Well there Special mission variants remain as do the bulk of there stocks well the Older C130H and Y8's as well as lesser lifters in there respective mother services are phased out. basically Y9 would replace Y7 and everything but the most specialized and even then Y9 would be modified to take the job.