No highs without lows?

Buder-Gröndahl, Nóbrega & Panagiotidis' (2025) theory of features as natural numbers makes the prediction that the sequence of heads within any syntactic structure can only be reduced from the top. This chapter discusses some predictions of this theory, showing that in some cases it produces the right result, but at the same time points out the problem that optional features, like Divisor, present for the theory.