Suppose you have a haystack... and you take some hay away. Do you still have a haystack?
How much hay can you take away before it's not a "haystack" anymore? The distinction may be arbitrary, or it may be discrete. Same with "first man"... was it a single genetic difference that puts someone into that category? Is it a line that you draw and say, "this isn't much like modern man, but it's what we will consider 'man'"?
This is the fundamental genetic defect of creationists. Despite their everyday ubiquitous use and observation of continua, they do not comprehend continua. They will tell you they comprehend them, but then when they describe them you realize they are clueless! They live and breathe the fallacy of the beard. It seems genetic, anyway, but I know it is really just the power of the cult over the mind.