You can't fix that without sanding the old off and giving the new something to grab onto. If you scratch/gouge out the cracks, you'll just end up with stripes of a different color, even if the gelcoat repair is supposed to match.
That deck rotated too far- I suspect that someone pulled the pin on the actuator and either accidentally let it flop back or the wind took it. It can't do that without one or the other- if you remove the pad and rotate the hinges, they'll match the gouges exactly.
Keep it from moving too far, don't over-stuff the storage area and don't twist the deck.