By Mike MacAdam Gazette Reporter Basketball practices are open at the Alumni Recreation Center, so it’s not unusual to see a grey-haired retiree in a Siena golf shirt mosey on in. And these spectators have their opinions, but most of them don’t then actually step onto the court and start teaching the Saints how to play basketball, like an AARPster telling the chef how to stock the buffet at Golden Corral. On Tuesday, one did.