Actually, they rejected it because it looks too similar to the previous one I posted.
OK, so this is about opening strategy. But first, a note on the naming of pieces. All the pentominos have been given a name by the mathematicians. Green has played , from the corner to the centre, FWXY. Blue has played PXWF. Yellow has played YXWN, and red has played FXWN. The Barasona opening as discussed on BGG is FXWN. Note that this gets you to 3 spaces from the centre point. The order of the X and W is irrelevant - you could play FWX as green has done. However playing Y rather than N gets you one square closer to the centre.
As demonstrated by blue, it is possible to start with P rather than F, but that leaves you one space further from the centre. Why would you use this variant? I don't know. As demonstrated by yellow, you can even open with Y, but that also costs you because you can't use it as last in the chain to reach towards the centre. Of course, having an N in the centre gives you more points to work from.
So here's my characterisation of this family of openings. X and W are played as the second and third moves, in either order. The first move is Y, P, or F. The final move is Y, N or F. Between the first three tiles there are only single square gaps, making it expensive to cross the line.
If only I actually played this game, I could put this theory to the test!