Im genuinely curious because I love the Terradon models but personally just cant justify them - What role do the Terradons play in your army that a buffed unit of 40 Skinks cant do? The points are the same, the damage seems almost the same (assuming 1 shooting round per turn, Parting Shot makes this significantly different) and the movement with run & shoot is pretty much the same. 40 Skinks just seem to offer a lot more consistent damage every turn, and also guards an objective a lot better in my eyes.
Im really not a fan of teleporting my Skinks too far. I went for the throat a couple of games but it didnt work out.. Massive misplay! It meant my 40 Skinks were stranded outside of the Skink Priest/Starpriest buff range, so when I lost the roll-off and my opponent noticed it, he gave me the turn and it meant my Skinks were now an entire turn + his turn with no buffs. 80 shots from non-buffed Skinks is almost not even worth rolling dice for, the output is that bad.
This is theory crafting with teleporting a blob of skinks. If you take the Shadowstrike battalion, you can drop the hero from that battalion in with the teleported blog. So you buff a blog on the table, teleport it, then drop the battalion's hero in with the teleported unit. Now it's there for command abilities and to buff the unit next shooting phase. but it requires having a priest or starpries in space turn 1, so not getting their buffs that first turn.