So lvl 6-10 are the weakest that Ranger get. Going by that build logic Ranger 5/Druid 7 would be a better split since it would at least net 4th lvl Druid spells. The Dryad summon is pretty darn good even if you will miss out on the Elementals. You will also want to get the Hag’s Hair it’s the only way you make 18 Dex/Wis and pick up Sharpshooter.