It's a great PR move, I won't deny that, and it's a lot of fun for us fans to see the guys we cheered for as kids and youngsters. But I don't think current players care much about meeting a player from the distant past unless it's someone that is a legit superstar like Dickerson or someone else that was a household name.
Bringing PManning back to Indy for a visit in 20 years will have meaning to Colts players, bringing back the TE or LG that played with him probably won't. However fans will love it. Why wouldn't we?
