I doubt Factor 5 are any better than the main Tecmo team, if both where to be given the same budget.
I disagree. Tecmo has yet to show they can produce a modern graphics engine, one that allows free camera roaming inside a virtual world the entirety of which is much larger than available RAM. All their games contain the typical compartmentalized level design, in which the game world is divided into distinct areas each of which is tailored to fit within memory.