Few things, Scougalls longest run of consecutive starts is 5. He's only played more than an hour of football 16 times.
He's only played 1700 minutes for Saints, the equivalent of 18 matches.
He's scored two goals in that time.
He's a high end target of TWs, who's been handed a massive wage, and he's been completely written off based on half a season worth of games based over 12 months, with him barely getting a run of games. You could count the number of games in his preferred position on half a hand.
He's not contributed enough, clearly, but compare and contrast those figures to Alston, (first season, 2000 minutes, 3 goals - second season, 1800 minutes, 2 goals), who's continued to get chance after chance until he's finally nailed down a solid performance level in his preferred position, and explain how it doesn't seem harsh how Scougalls been cast aside.