#1 Braun Strowman
Simply put, Braun Strowman in The Shield could make the faction unbeatable and even more dominant than they ever were. Strowman has, it seems, fallen out of favour to challenge for the Universal title in the eyes of WWE's creative team, which is a pity considering the great run he had in 2018.
Strowman in a faction may seem unnecessary as The Monster Among Men has previously shown that he can destroy more than one person single-handedly.
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But, if WWE wants to make The Shield a dominant faction once again, a Superstar of the stature of Braun Strowman will give The Shield a huge fillip (pun intended) almost instantly.
The only downside to Strowman joining The Shield would be that WWE will have two fewer top Superstars to face the Universal champion (if one of the three is holding the Universal title), but there are other titles that can be won by The Shield to dominate RAW.