[Funkycorm]

So this answer is different for 21 and then for all previous versions.

For 21: Morale means nothing other than making sure it is green for contract negotiations. No impact on player ratings.

Now for 20 and before: Make them both aces. The one that won't be your ace and be your number 2 will have a slight morale hit. To combat this and assuming they are not at max contract, pay that number 2 starter slightly more. If they want 15.1 per year pay them 15.3 per year. It will negate the slight dip in morale from the role and not impact ratings one way or the other.

Honestly adds a bit of realism. Hey, you aren't our number one guy but we value you so here is some more money.