You can continue to deny the obvious, scripture says we were "in Him" before we were sealed in Him.If they do not happen simultaneously, there is a temporal (time) gap. I see no need for that, neither scriptural nor logically
just like there is no time gap between regeneration and faith, nor between faith and justification
The question you must ask is why not accept the sequence given in scripture?
Here is one for you, since you were chosen for salvation through faith, your faith came before your election, which means before you were put in Christ and made alive (regeneration.)