Portsmouth have surged seven points clear of the relegation zone after beating Middlesbrough, Ipswich and Leicester in one remarkable week.
Parkin: "I didn't see it coming. In all honesty, if they did stay up, I thought it would be courtesy of the odd point, maybe it would go right to the end.
"Now it looks like it will be quite comfortable. They've had an incredible week, beating Middlesbrough last Saturday, beating Ipswich on Tuesday and now Leicester in a real relegation six pointer.
"They've had to cope with injuries too and Josh Murphy was on the bench today for the first time in an eternity.
"Conor Shaughnessy, a massive player for them, is having to be managed and even today, they lost Keshi Anderson and Terry Devlin early on in the game.
"It wasn't as good a performance as Ipswich, but the result is as big, if not bigger because of Leicester's position.
"The flip side is Leicester are very, very close to being confirmed in League One, a decade after they were Premier League champions. Imagine how their fans are feeling?"