PukinDog, thanks for your response.
You reference minimum separation/wake spacing but SFO don’t operate to minimum spacing, they provide gaps for departures from the crossing runways. Look at the landing rate, it’s 30 per hour which equates to about 5.5 mile average spacing.
A gap of 8/9/10 miles would easily accommodate 3 mile separation for the DLH (although you’d only need a 6 mile gap). All they had to do was add 3-5 miles to an existing gap.
SFO had 40 minutes to organise an extra 3-5 miles.