Here is a thread worth reading about Padilla. The leader of the mosque, referenced here in the 1995 date from Pembroke Pines, FL:
1995 – Pembroke Pines, FL – studied Islam at Darul Uloom Institute mosque, took Sat. morning courses for 3-6 months using the name 'Ibrahim' until the 'extremely observant Muslim' 'disappeared'
...says something different about Padilla... not that he was at the mosque for 3-6 months in 1995 on Saturdays, but he was there "around 1995", until about 1997, when he, again, "disappeared."
Here is the original Wash. Post story link where I found out that information about Padilla at the mosque:
Al Muhajir Alleged to be Scouting Terror Sites
Mrs K