There’s a dearth of competent editors over at Yahoo! Sports. Heck, there may be no editors at the website because any editor would know that the nominative case he is wrong following a preposition like between:
Any editor would know that there’s a word missing in what should be a couple of years:
And why can’t the writer and/or editor choose correct pronouns? The pronoun whomever is the objective case of whoever, which is the word the writer should have used since it’s the subject of the sentence.
Whoever wrote or edited this article should be embarrassed.