he's right, it would be redundant in the sense of making a t-72 sim when there's steel beast pro, although there are variables which mitigate redundancy; visual improvement, pricing, etc.
the best route would be to make another vehicle that has yet to be explored very fully. f-18 does fit this criteria as it has not received much exposure of late, nor has it ever been modeled to anywhere near dcs quality. falcon on the other hand has been aptly handled by bms, falcon 4 and a plethora of software, new and old dedicated to its simulation.
but i suppose i'm biased. i dislike famous vehicles and f-16 is as famous as it gets.