I actually never thought of putting his teleport decoy next to a health pad, i'm gonna start doing that.I played some time with Lark too.
What I like is that you can put a teleport point invade the enemies like a kamicase attack and teleport to safe place you marked
It works better if your safe place is near a heal point.
Outside that it is very good to defense places when you put a lot of plants on the place to up your abilities.
I do usually put his Spores all over the the zones though so my team can get non stop boosts and shred (hopefully)