...I think the question might be, If Efren were taught a pendulum stroke, a pause and all the rest, when he first stepped up to a table, would he have entered the world scene any sooner in his career than he did? How many more hours of practice and honing did it take with his unorthodox method? Who knows, with Efren maybe only 1 more hour, but probably a few years.
So Efren's stroke has hindered his progress, by "probably a few years"? A statement like that should qualify you for a free lesson and dinner from the SPF instructor of your choice.

As for Efren entering the world scene earlier - to hear Efren tell it, he was playing his best in the 1970's, before anybody outside the Philippines ever heard of him.
No, I don't think Efren's stroke hindered his progress. One could just as easily say it sped his progress, but I don't say that because I have no basis for saying that. All I say is that it's very rhythmic, very natural, and a beautiful thing to watch.