You didn’t add this option in the Djokovic thread though.
The forum allows a maximum of 10 poll options, if I understand correctly.
In the case of Djokovic, the poll option "Less than 17" covers both "16" (the scenario where he does not win any more slams) and "Less than 16" (the scenario where he does not win any more slams and is stripped of one or more or them). I could have merged two of the other poll options into one, but I decided that the primary goal of these polls was to provide enough granularity in the 3-way slam race between the members of the Big Three, in the most important range of values. I wanted to give the same set of values for the upper range of poll options for each member of the Big Three, the highest two options being "More than 26" and "26". Therefore, I made "17 to 19" a poll option so that we could differentiate whether the poll shows Djokovic tying, surpassing, or falling short of Federer's current slam count of 20, while still using a maximum of 10 poll options.
In retrospect, I probably should have made "25 to 26" a poll option rather than using "25" and "26" as separate poll options, as this would have freed up an additional poll option.
But in the end, it still works out for Djokovic because "Less than 17" is currently showing only 4 votes, which is less than "Less than 19" for Nadal (7 votes) and "Less than 20" for Federer (7 votes). The main reason for providing these poll options for Nadal and Federer is to separate the "hater" votes from the "thinker" votes. It just turns out that Djokovic has fewer haters on this forum, which partly explains why this option has fewer votes.