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there's an 'active' flag on the user page. It's likely not default synced to Marketo. You should just be able to add it to the sync and then be able to report on it.
Do what JD suggested here. Another basic workaround is to filter on your active sales team as opposed to excluding the inactive team. Typically much smaller and easier to get a list of (sales distribution should always reflect active reps if up to date).