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Leaking injector would be what i’d check for. Crank it over a bunch of times then pull the spark plugs and see if one is soaked. Doesn't a failing coolant temp sensor cause this issue too? Don't see much of it these days but it used to be a fairly common suggestion after cam, crank sensors

My v7 STi wagon has been intermittently doing a similar thing, it will crank for 5-6 seconds before it actually sparks and fires. Like you said I always prime the fuel pump beforehand but it makes no difference. In my case I tried experimenting with cam and crank sensors since i thought it may be a sync issue but that did not help. It seems like the ecu is not sending an injection or spark signal until it has been cranking for quite a while. My car does it really intermittently (maybe once a month) so it has been difficult for me to diagnose. I did wonder if I had a leaky injector that was causing it to flood when shut of and only clear after cranking for a while. Sorry I don’t have an answer for you but I’m very interested to hear if you find anything.

Mca "street performance" Coilovers installed, with custom spring rates and their "stealth" option colouring. brembos on, had to drill and helicoil one of the front caliper bolts as it was stripped. Bendix heat treated vented slotted front rotors with z series pads, Bendix slotted vented rears, again with z series pads. Also stuck in some endless handbrake shoes, should make a nice difference. Bled it all out, both sides of the calipers, pedal is still a bit squidgy in the first little bit of travel. Need to re bleed it, but gotta get more fluid first. Looking forward to getting this beast tuned. Been driving it around for a while on wastegate pressure and break in tune, and it absolutely hauls arse.