The movie plot is built on a chain of coincidences, obviously poised to get the seven main characters of TOS and essentially only these characters together on the Enterprise in some fashion, to link their destinies as if it has to happen again in the parallel timeline, under totally different circumstances. The first link in the chain is when Nero arrives in the past. It is almost the exact place and time where Winona Kirk is heavily pregnant with her son, who would be the best friend of Nero's archnemesis (or so he believes), Spock.