9.4. With the exception of a Player placed on injury waiver under Rule 13, a Player who
is removed from the Team Roster may not be returned to that NBL Club's Team
Roster in that NBL season, unless he is replacing a Player who has suffered a
season ending injury or illness. The Club must provide to the NBL medical
documentation in accordance with Clause 13.2, and all such replacements are to
be made subject at all times to the requirements of Rules 9.1 and 9.2.
9.5. Notwithstanding Rule 9.4, the NBL General Manager may approve a Player being
used as a replacement Player for the same NBL Club more than once during the
course of an NBL Season for reasons other than the occurrence of a season
ending injury or illness.
This is from 16/17 rules pdf Manu but someone linked a more recent one on TGsports website on this forum a while back. You might find that post if you wanna do the work.
Anyways 9.4 states that a returning player can replace 'a' player on injury waiver not 'the', so techically Felix can return to replace any United player placed on waiver as long as it doesn't exceed the 3 restricted player limit.
9.5 gives J-Lo the ability to prance around with C&C music factory's I Got The Power blaring while re-instating Felix into the lineup.