Operations in Jan -Mar 1944 were not deep into Germany, they were not even solely US forces. To continue the attrition required hitting deep into Germany and also preparing for D-Day. You are far too partisan, if the P-47 and P-51 were identical in all respects for bomber escort the P-51 would be chosen because the P-47 was better at CAS.In January to March44 when the Luftwaffe went over the top of the atrition curve and we won air suppirriority it looks pretty grey to me. Maybe you should have another look at you own valley.