How many first ascents did he make on El Capitan, and has anyone else done more?
Addressing the first question:
From the 'Obscurities' .PDF here on SuperTopo
Charlie Porter Routes on El Cap (ordered West to East)
1. HORSE CHUTE, with Hugh Burton
2. EXCALIBUR, with Hugh Burton
3. SHIELD, with Gary Bocarde
4. GRAPE RACE, with Bev Johnson
5. NEW DAWN Solo
6. MESCALITO, with Hugh Burton, Steve Sutton, Chris Nelson
7. TANGERINE TRIP, with John-Paul St.Croix
8. ZODIAC Solo
Maybe Werner or deuce4 can help out with the second question?