quam magnum est in viribus suis latus viri
I ask you about in viribus suis.
I suppose this would be a form of abl. of respect or abl. of standard of measuring,
but in the grammar, I can't find an example in which the preposition in is added to those abl..
But, if prepositions are such things as are used to specify the meaning of bare case, I think the addition of in is no problem even if the grammar doesn't mention it....
then, do you think in + abl. can express "in what respect?" or "in what standard ?" ?