Kev, the pre-2005 schedule was almost all narrowbodies except for one or two 757's which flowed ATL-DFW-LAS or ATL-DFW-LAX.
in 2003, that 59 per day worked out to ~9000 seats a day. Connection had ~200 ops per day for around 10,000 seats, for a consolidated 19,000 seats a day.
Today, they're around 3,000 seats a day.
As for the share claim... Sure, I'll believe WT when he says DL "retained" 8% of the local market.
From memory, AA had ~60% of the combined DAL/DFW market, WN had ~15. If DL also had 15 (doubtful, but I'll play along), then everyone else was fighting over the remaining 10%, which is entirely possible given how little presence UA, US, and CO had at the time. It's been a decade, so I may be off by a few points here & there.
Also keep in mind that DL had 15%, and picked up the 2-3% NW was carrying to MSP, MEM and DTW. That means they fell to about 5% pre-merger.
Now, we're supposed to believe that being 20% of its pre-2005 size on available seats (fact), that DL is only down 50% in their market share (claim).
The only conclusion I can draw from that is DL was really, really sucking wind when the hub was in operation.
Since WT was gainfully employed by DL at the time, I'm sure he can refute that if he wants to.