Last month, I wondered aloud why Aroldis Chapman was featured as a Yankee on his 2017 Heritage base card, but as a Cub on his Chrome and mini parallels.
Well, fear not: the blogosphere's most loved Sooz came to the rescue and gave a reason.
According to her,
"It's the timing of when the cards are due to the printer. The chrome and parallels have to be there much sooner than the base cards. There is essentially a late form that goes out for the base to get free agent signings and offseason trades. So Topps tries to capture it when they can."
Sooz is definitely an authority on the subject, so this answer is good as gold for me.
Thank you, ma'am, for your insight!