Matters of Messiah

Engaged in the written and oral Torah like his father's uncle
King David was busy with matters of war, managing the monarchy, bureaucracy, family quarrels, etc.
I saw someone who explained that the intention was that he was a religious person who had a hand and a foot in the written and spoken Torah and was very knowledgeable, and the intention was not specifically that he was a giant and extremely knowledgeable in the written and spoken Torah.
A reasonable interpretation?