The difference being a year ago today we still had 7 games left with the Tigers (who were in first place at the time), whereas the White Sox only have 3 games left with us this year. On top of that, our schedule last year is practically identical to our schedule this year (Toronto, Oakland, KC and Cleveland), whereas down the stretch the White Sox have a lot of Oakland, Boston, and Los Angeles on the schedule.
I agree the Twins have an easier schedule from here out, but the Sox still are playing teams that are all out of their races and can be counted on to play AAA players to get looks at them.