G-GDFO and G-GDFY, both operating flights from BFS/GLA to TFS today both diverted into FAO, causing a delay of about 1.5hrs on both sectors
G-GDFO is a B737-300, which is regularly performance limited out of BFS.
G-GDFY was operating from GLA which as others have said is a little further, however there are many other factors....
Where as FUE bound G-LSAI made no diversion.
G-LSAI is a B757, they have performance to spare.
You are comparing 3 different types of aeroplanes, to 2 different destinations, there is no correlation I'm afraid.
After-though -
Be absolutely sure though, the tech stops for fuel in FAO would not have been done unless absolutely necessary, it costs plenty to do something like this for a start. Better to stop en-route and get to TFS feeling comfortable than finding you are getting into TFS with just enough to find the infamous windshear has sprung up and you are sweating on a divert to LPA where it too is blowing a gale.