Powell, 19, joined Manchester United last summer after rising to prominence at Crewe but has found first-team opportunities hard to come by at Old Trafford, so Coyle moved to bring him to Latics on transfer deadline day.
The former Bolton boss helped shape the careers of current England internationals Jack Wilshere and Daniel Sturridge in similar deals and anticipates Powell's future could follow a similar trajectory.
"I said to David (Whelan, Wigan chairman) when I was bringing him in, for me it was a win-win-win situation," said Coyle, whose side had taken the lead after 12 minutes at the DW Stadium thanks to fellow loanee Ryan Shotton's header.
"We would win out of it because we got a terrific player, Nick Powell would win because I've given him a platform to showcase his talents and Manchester United will get back a more-developed player with more experience and a player who can challenge; as we've done before with the Sturridges and the Wilsheres.
"There's no doubt from me he can have a huge career."
Powell was one of seven players who retained their place in the starting XI from Thursday's goalless Europa League draw against Zulte-Waregem, Wigan's first fixture in a major continental competition.
That night the teenager played as a lone striker due to a spate of injuries and, when Callum McManaman became the latest casualty in the second half here, Powell found himself in the unfamiliar position once more.
He would get his reward for his continued running, though, as he capitalised on an error from Town goalkeeper Dean Gerken in stoppage time to casually clip the ball over a defender and into the corner.
The manner of the goal, Coyle felt, epitomised both Powell's natural ability and his confident demeanour.
"When I was a striker it would have been taken first time!" added Coyle.
"The lad came back on the line but you wouldn't have thought there was anybody there the way he nonchalantly dispatched it, but that's Nick.
"He's got so much belief and ability in him and hopefully I can give him more and it benefits the football club."
- Sports & Recreation
- Nick Powell
- Manchester United
- Daniel Sturridge
- Jack Wilshere
- Ryan Shotton