No I can't. Just like you can't say as a statement of fact that he wouldn't have. There were experts (former players now turned analyst) who swore up and down that once Wentz went down the Eagles were done. I don't follow the NFL a lot but the little I did follow it seemed the lack of production from Foles when he initially took over for Wentz was simply due to getting used to playing and getting the flow and feel of the game. What he played five regular season games? Riding the bench for 11 straight games then being asked to start and play has an adjustment period. It seemed by the playoffs he had settled in and gotten the feel of playing. It also seemed Pederson became more confident in what he could do. I know the excuse of "teams not having enough film on him" can't be used. He has literally years of film of him playing quarterback for teams to breakdown, study his tendencies, strengths, weaknesses and game plan accordingly.
My personal opinion is, no, Foles isn't as good of a QB as Wentz. But I think with Pederson's talent at playcalling and dealing with quarterbacks. He was able to get the most out of Foles' talent. From a throwing standpoint, Foles' isn't a bum. He has passing talent. I think he is more of a system quarterback than just an overall good quarterback. I think Pederson's philosophy fit right into what he does best and it showed the more he played. By the time the playoffs hit, the guy was dropping dimes all over the field and was doing it for more than one game. It was blatantly obvious he had gotten comfortable and very, very confident.