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The prequalifier is useless. Someone said they put their dog's name and made up the rest and it came back with a "recommendation". Sorry, don't know about second cards.
Internet rumors state that 2nd Disco card will most likely be granted after the 12th statement of the original. High probability of failure before 12th statement.
There are varying DP's on double cash back matching if applying for 2 Disco ITs.
Cash back matching does work for MILES/IT combos.
Prequal is extremely variable. Gotta unfortunately trust your gut and know your reports.