Saw Gerrera’s role was chopped down in the re-writes along with Moroff and Pao and his partisans and the conflict on Jedha and also Scariff (Although Saw never made it that far I don’t think).

Bodhi Rooks role was developed further.

So there is your answer as the movie had already been shot before they changed it so that’s why you have only scattered appearances which Bodhi was a much smaller character and Saw was a much bigger Character.

They only had so much wiggle room to shape it differently.

Cassian Never met Jyn until Jedha either by the sounds of it and Mon Mothma recieved the imperial coded transmission sent by her father totally wiping out the plot with Bodhi Rook and the tentacle monster.