No, the RH rockers being in AND the engine being mechanically timed right could not cause this. If it was timed right the engine would turn OK with them in or out.
The good thing about having the RH rockers out is that this puts 50% of the valve springs out of the picture so that there is 50% less opportunity to jump while pulling the chain through. Also, with the rockers out there is no possiblity of hitting anything on that side even if things get out of whack during chain installation - it's possible to readjust the RH side before reconnecting the chain even if you miss a tooth or two by lining up the indicator on the cam bearing to the indicator on the gear.
I have some ideas on how I would proceed but I would like to defer to people with more experience. Don't "jump" to action on this.
The cams turn 1/2 of the crank. Each tooth represents a lot of degrees.
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