I was trying to remember who Valanciunas reminds me of
There was a little of Rasho - not very athletic and definitely not a scorer but a very useful utility guy
But actually he is a lot like Amir Johnson. Works in paint, deadly off pick'n'roll with good midrange jumper and freethrows. And fouls a lot

Except Jonas has what, 2-3 inches on Amir? So he can finish much easier and I expect rebounding to be better as well