No it wasn't.
No what wasn't?
1) Transfer embargo was 2nd march
not sure what that has to do with what I said.
We had 53 points from 36 games. Ignoring pre-robins it was 50 posts from 29 games = 1.72 points per game, so 17.2 points from the remaining 10 matches. Total of 70.2 points for the season
2) administration 21st march.
We had 60 points from 39 games. Again ignoring pre-robins 57 points from 32 games - 1.78 points per hand so 12.5 points in the remaining 7 matches total of 72.5 points for the season.
Swindon finished 6th on 74 points with a goal difference of +33.
We finished with +7 goal difference so would have needed 75 points. We wouldn't have made it without going on a run of 4-5 wins in a row, which we never did despite fantastic form.
We scored 1.88 Points per game with Robbins and it's much greater if you count his rein from a 2 matches after he joined to 2 matches after he left. But even just using the games he was in charge of we'd have ended the season on over 73 points, yes swindon finishes on 74 but they beat us during our bad spell once he left so there is a very good chance we'd have made the play offs. As I say if you look at points scored once Robbins was settled in which is a better metric we would finish on even higher points.
I'm pretty sure Leon Clarke had been playing through injury for a few weeks prior to his lay off so not sure how he could have avoided being injured.
http://www.bbc.co.uk/sport/0/football/21784734
Different manger, slightly different team, different tactics, every game would have been different and so whatever caused Clarks injury would likely not have happened. So unless he'd had it over a month it likely wouldn't have happened. Also we would probably have strengthened the team had we paid up our rent. We were told we were getting multiple people in the last window that never materialised.