The 21-year-old, who netted the spectacular match-sealing goal against Charlton on Wednesday, enjoyed successful stints at Swindon and Colchester last season before spending just over a month in Division One with Coventry before being recalled to the club ahead of the Boxing Day fixture with Portsmouth.
It is fair to say he hasn't looked back, has started six of our 11 games since making his debut at Fratton Park and substitute for the other five.
David says his emergence on the left side of the team made the parting of ways with Jonathan Blondel an easier decision.
"It was a fine goal when we needed it and John gives us shape," said David on the stunning Valley strike. "We allowed Jonathan Blondel to go back to Belgium, a very good quality player but he's small and the frenetic pace of the Premiership might have come a little early for him.
"Jackson had been in Blondel's shadow a little and we loaned him to Colchester, Swindon and Coventry. You never know how a player is going to cope with the mental strain of the game or the criticism, but it looks like John's got a good temperament and that's nice.
"I know he's a good footballer, nice touch, can play the ball, is composed - and it also looks like he might have the temperament."
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David Pleat considers that Johnnie Jackson demonstrated he has the right temperament for first team football during recent loan spells in the Nationwide League.