Does the level of your First Stringers matter?

Does the level of your First Stringers matter? - Blackboard with YOUR LIFE MATTERS inscription on black background

You can have 5 first stringers in your squad, but can only bring one with you as a sub. If you really only ever take the same sub with you (I like my healer...) should I really worry/try to level up the other first stringers? Does it increase their effectiveness in other aspects of the game?

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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