Posted this in another forum but didn't get an answer, any help greatly appreciated.

******Can someone clarify this for me:

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(K)SEASON-ENDING INJURY REPLACEMENTS (Season Ending Injury List)
A team with a player lost to a season-ending injury can place the player on the Season Ending Injury List and replace that player on its roster, while remaining responsible for the full amount of the injured player’s salary. A player can be placed on the season-ending injury list once another player has been signed as a replacement (provided the team has budget space). International player limits still apply at the time a season-ending replacement is made (with the player being replaced not counting against those limits).

(L) SHORT-TERM INJURY REPLACEMENTS (Disabled List)
A player who has a short-term injury can be placed on the Disabled List once another player has been signed as a replacement (provided the team has budget space). The team will remain responsible for the full amount of the injured player’s salary on the salary budget. Note: the injured player will have to sit out a minimum of six MLS League matches before he can rejoin the team’s roster.
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Questions:

1. Does the replacement HAVE to be a keeper? (Not asking what they SHOULD do, just asking about 'MLS Law')
2. Does the team have to have cap space before they sign the replacement or does it happen at the same time?
3. Could they sign a keeper at say $100k (or any amount) and then still have some cap space free to sign someone else?

Thanks so much