Another fact expected in a single sun system is that comets should come from all directions more or less randomly. But historical comet pattern data shows comet paths tend to be non-random. Fully 1/3 of 82 long cycle comets come from a narrow belt.
This could lend support to a binary theory whereby a large, distant mass disturbs comets. Other scientists have come to a similar conclusion and some think it may be a 10th planet or failed binary with a large orbital period. Presumably, they are not aware of the evidence to indicate our Sun is curving through space and that we may be in an active binary system.
Large Celestial Body influencing non-random Comet paths.
Matese and Whitmire propose band from Cassiopeia to Polaris.
Murray believes it is in a small patch around Delphinus.
Richard Muller at UC Berkeley also thinks periodic extinctions may be indicative of a very large cycle binary.