Kawika is a tall?
Lō‘ihi is a verb or an adjective, but I'm not sure what it would mean as a noun like that. Those sentences that begin with "He" are equating two nouns. Here lō‘ihi is just a plain old verb and is fine at the beginning of the sentence.
The thing that might be confusing you is that in English we use the connecting verb be/is to connect nouns, but also to connect an adjective to a noun. As in "he IS tall." But in Hawaiian, most adjectives are actually just verbs and don't use the same sentence structure that you use to connect two nouns. Instead you use the same sentence structure that you use for other verbs:
‘Ai ‘o Kawika. "Kawika eats."
Lō‘ihi ‘o Kawika. "Kawika is tall."
According to a lexicon i use it can mean both http://ulukau.org/elib/collect/ped/index/assoc/D0.dir/book.pdf