"I'm going to think more about the one that got away than the two we've won," Guy said. "I'll let the fans and the media talk about dynasties."
Arizona beat Philadelphia for the second straight year to become the first team since Tampa Bay in 1996 to successfully defend an Arena Football League title. The Rattlers also won in 1994 and 1997.
Davilla completed 20 of 29 passes for 315 yards. Rod Windsor had 10 catches for 145 yards and two touchdowns, and Maurice Purify caught four passes for 83 yards and two scores. Garrett Lindholm was 6 for 6 on extra points and made both field-goal attempts.
Philadelphia, which trailed 45-33 with 9:30 remaining, had a chance to win the game in the final minute.
Arizona was driving in for a clinching touchdown, but Soul lineman Ko Quaye forced Rod Windsoe's fumble that the Soul recovered at their own 1 with 53 seconds left.
However, Philadelphia couldn't get a first down as Rattlers defender Arkeith Brown, who had never played defense in a postseason game before Saturday, swatted away Dan Raudabaugh's pass intended for Tiger Jones on fourth down.
"Fifty-three seconds left in arena football, you're supposed to score," Jones said. "It's on us. It's on me."