Multi-talented people were very useful, and if he had many more that the Doctor didn't know of, well. Not that the Doctor only cared about usefulness, but it did open up options when one needed certain... talents. He just had to figure out what Gabriel's other talents were, at some point.

"Oh, you know. This and that. Mathematics, botany, zoology, archaeology, a bit of anthropology..." What could he say? He studied things. A lot. And while that was certainly not the extent of his dabbling, it was what he thought of given his research into this planet. "And I do brew a fine cup of tea, if I do say so myself," he added, a hint of a grin on his face before he took a sip from his cup.