When old Biff goes back to 1955 and creates a timeline B (which is reality now), he started to fade in 1955 of timeline A after handing the magazine to his younger self. Maybe this is because he doesn't live to be that old in timeline A after he makes his younger self a billionaire. Maybe it gets him killed before he can get past 1985 and that old. In fact, Marty actually stops timeline B from happening after all.
So when he was fading back in 1955 after handing in the magazine, he thought the only way he can survive is by quickly going back to the future. But he arrives at the timeline A instead of B because he doesn't even exist in timeline B in 2015 because he gets killed long before 2015 in B.
Also he still survives in timeline A for few seconds after arriving because of the slow fading theory and because he doesn't belong to timeline A either. Because time still allows you a few minutes to correct your mistakes, Biff arrived in timeline A.
If he was smarter, he could arrive back in 2015 10 mins earlier so that he could stop himself from taking the Delorean back to 1955, thus stopping any changes or his death or go 10 mins behind in 1955 to stop himself giving the magazine to his younger self. But he was stupid and came to future where time was already changed and he didnt exist, so why A?
He had a better chance to rectify his mistakes at timeline A than in B. He was more linked to A than B because he came from A and never been to B and the Delorean also belonged to A. Marty and Doc could not go back in A because they exist in B now. Old Biff doesn't exist in either, but came to A just by the mercy of time as a chance to rectify or bring the Delorean's molecular structure to where it belonged.
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