The posting doesn't specify which TDP, which would help understanding.

TDP for sql with a variety of different versions depending on which server

Which means that to TSM they are all active backups and TSM will
therefore not expire them. They have to be expired/deleted from the TDP
side, e.g. rman for oracle.

is that the case? tdp manages the inactivating of the prior full on the TSM 
side? so this can be related to be akin to similar to a file backup where once 
the file is deleted (or marked inactive by TDP) the backup falls under the 30 
day expiration window.

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