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Seeker it will depend on the scope design , but Newtonians are prone to it due to the mirror cell movement and the overall tube length flex.
If an OTA and guide scope mounting is well designed it can be eliminated .
I don't have problem with my Newtonian but it's not an ordinary mirror set up.
Refractors are less prone to the problem.
I have has several scopes in varying configurations and have used a guide scope in all except one .
Didn't have any problems.
A certain SCT I once had did have problems due to mirror flop and I used an off axis guider for that but others get away with a guide scope now with better mirror lock up.
Time will tell with your imaging results.
Mark
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