Supppsedly, Muglos Raonic got a wildcard at Eastbourne so he isn't even playing here
Raonic definitely has a Wild Card for Eastbourne where he'll now be the top seeded player.
But if he lost early at Eastbourne he'd probably be found a match at Boodles 'cos it's an exhibition event and in the past has found space for an extra player or doubles pair (or British junior).
Boodles has always been flexible in giving top players a chance to play one or two matches if that is what helps them to prepare for Wimbledon. So, they have an 8-man draw BUT it's open to change to allow guys to opt out and others to take their place if needed.
Previously they played a round robin so most of the participants played 2 or 3 matches. Now (see post above from Stoke Park) they've got a knockout format but even so some of the players who lose on Tue or Wed may still be around (it has 5 or 6 great quality grass courts besides the show court) for practice and or to play an extra match in the afternoon of the "Semi-Final" or "Final".
It isn't like an ATP event.