Andrew has very long and flexible fingers. Ditto Christopher and Matt. I have been playing uke for some years now, my fingers are short – and old! I have learned to find my own way to shape certain chords, especially those involving four fingers. Because it’s not just about playing them, it’s about moving to them fast from other chords. Fir this reason I play some chords in a couple of different ways, in particular D7, Fm and G. Depending on where I have moved from or am moving to. I take Andrew’s advice on fingering (and that of the others) when I can but sometimes we just have to find the way that best suits our own fingers.