Your Savage cam and tappets cannot "dry start" by design -- the cam lobes dip into the head oil bathtub once every revolution and coat the cam lobe rubbing surface with a fresh coating of oil.
You can dry start a plain journal bearing in the head though, if you haven't run the bike in months and months. But this rarely happens.
ZDDP does its thing when we are roaring our Savages through the mountains -- temp is up high and contact line pressures on the high RPM tappets and cam lobes go past any oil film's rational ability to hang in there. ZDDP was invented to recover from the low cost flat tappet engine's design flaws, really.
Modern engines have bearing rollers to remove this high point load, or else really big smooth flat caps on the valves that get directly actuated by a large wide cam profile (sports bikes use this generally) that once again remove the high point loading.
NO ENGINE built today uses the old flat tappets ('cept ours of course).
Having found a good full synthetic base oil ZDDP break-in additive, the temptation is to keep on using it. After all, a 4 year supply is only $12 .....
If we had decent silica control with our air and oil filter system we could use the stuff to run a sump of oil endlessly, just adding oil as needed and putting our shot glass of Red Line in each spring to completely refresh our critical oil packages.
But we don't have good silica control in our Savage at all, our silicates build up in the oil because our air filters don't stop all the dust and our oil filters pass all the tiny fine silicates dust right on through (eventually the oil filter plugs up with the little fine metal bits from the tranny and cam chain). So, even with a good full synthetic I still have to change out the oil out every year and swap out my oil filter (super magnet boosted for finer ferrous filtration, btw) every 2 years. I do it simply to get all of the built up silica dust out of the engine.
I don't recommend this drain interval to you guys at all -- my bike has a heavily modified air filter system and a very heavily modified oil filtration system that supports this sort of drain interval.
.... that Red Line bottle looks temping, don't it? Real head crack candy to the "additive addicts" amongst us, ain't it?