When Saratoga won NTN in 2004
-Lindsey Ferguson, Nicole Blood, Karyn Delay, & Caitlin Lane went on to win the NIN 4xmile in Winter 2005 as well as break the national record. I think Blood, Ferguson, and Lane were on Saratoga's winning 4x800 at nationals that year as well.
-Ferguson then won the 2K steeple at NON in Spring 2005
Prior to the NTN win:
-Blood had won the AOC (which turned into NON in 2005 I think) 2004 mile championship and Ferguson won the AOC 2K steeple title.
-Blood, and Ferguson were also on Saratoga's NIC 2004 4xmile championship team. While Lane and McElroy were on Saratoga's NIC 2004 DMR championship team
So I guess Blood and Ferguson meet your Sischo criteria for 2004 and Ferguson could extend into 2005 as well if you went by school year not calendar year.
After Saratoga's NXN runner up finish
-Keelin Hollowood, Bri Bellon (who was on that 2004 4x800 with Lane, Blood, and Ferguson) and Amanda Borroughs were on Saratoga's NIN DMR Championship team. Those three plus Cassie Goutos were on Saratoga's NIN 4xmile team.
-The same 4xmile team won outdoor nationals as well.