I found something new. Now a Striker needs to also be decent in the AMC position to have a decent role of False 9 in the striker position. This is a change from previous versions. Before all striker roles were unaffected by the person's position score in a different position. In fact, any position's roles were not affected by any other position until FM23.
Here is an example. We have a person with identical attributes in FM22 and FM23. Their CA is 160. Their position score is 20 in Striker, but 1 in every position:
Here are his role scores in FM22:
Here are his role scores in FM23:
Again, this is the same person with the same exact attributes, identical in every way. Look how far the False Nine position dropped.
To raise the False 9 role score, I have to give him some ability at AMC! Here's when I change it to 8:
Notice the F9 went up to 137.
When I change AMC to 15, take a look:
It goes up to 152. A striker now cannot be that good (relative to his CA) as a False 9, if he's not also good at AMC, as well.
Other notes:
All attributes are filled in with no zeros (a zero means the game can/will assign it in game to fill up the CA), so that's not affecting it. Also, the CA did not rise when adding the AMC position, also not affecting it. It appears the CA multipliers for attributes in the STC and AMC positions are close enough to not rise the CA.
This is new to FM23. This is the first time (that I'm aware of) that a person's role score in one position is affected by a person's ability in a different position.