I remember reading that a while back as well.
I found this, though it says nothing of the reversed #51:
He can wear #51 as a Yankee. Or he can pay tribute to the greatest of Puerto Rican baseball icons, and wear #21.
An interview with Carlos Beltran...........................on October 15.
He did get one thing wrong:
Big Papi needs a dose of reality:
It's been about 20% in past 5 years. That comes out to over 40% in 10 years.
Keep in mind most of the gains will be concentrated on better