That doesnt make sense. Uncharted's engine was designed with PS3 in mind since it was an exclusive. If it was going to be used for the 360 the engine was already designed around the PS3's capabilities anyways and hence its as if it was already led on the PS3.
Vanguish was using the PS3 as lead platform and hence the engine was well suited for the PS3 and hence achieved platform parity. Why was that a bad thing for the PS3?
If Rising is led on the PS3 the same may apply there as well.
Do you think its going to have better results for the PS3 if it is led on the 360?
The latter is more likely to end up worse on the PS3
This is not an example where the engine was designed around the 360's capabilities and the game will be led on the PS3 instead. Its a multiplatform engine and game that will be led on the PS3