I think the question is not about capabillities. It all depends on if you consider the strategic bombing campaign a success. The P51 was crucial for the succes of this bombing campaign, so if the campaign is crucial for the defeat of germany, then the P51 was as well. But mind that the effectiveness of the strategic bombing (apart of the oilfields in Romania) is still under heavy discussion by quite a number of experts.1. How can anyone say the P-51 was not crucial to the defeat if Germany. How can anyone not put it in the top 10 aircraft crucial to Germany's defeat?
Not taking sides here, just putting some oil on the fire.