What really happens is when the fork deflects the bushing and seal take the hit, like a pivot point if you will. This is a big issue of why OEM seals and lower DU bushings do not last and wear down quickly.
The alternative to OEM would be Synergy Seals. They come with a backup ring which sets in between the seal and snap ring. This backup ring protects the seal and the DU bushing during the forks deflection, and most important, it keeps the seal axially straight!!
Good luck, Rob