If you take an index recommendation from missing_index_group_stats, it clears the data in this DMV. But then, is the statistics moved over to index_usage_stats DMVs, or does it start from scratch.?
For example. missing_index_group_stats recommends TableA (Col1,Col2), and seek could have happened 5000 times. Now you create this index, and the entry disappears for this database in missing_index_group_stats. Now, will it say 5000 user_seeks in sys.dm_db_index_usage_stats, or will the count start from 0 for this new index?