Don't know how the stealthiness of the airframe is linked to the power of the radar, but if it does, it serves only to be a detrimental effect as it limits the size of a nose cone you can fit it into.
And stealth is definitely not everything. Especially in an airframe supposedly expected to be in service 3 or 4 decades from now...the ability to detect stealthy aircraft is already in its infancy, give it another 10 years and it will be well developed. Guaranteed.