Is Theravada Buddhism the only modern representative of Hinayana Buddhism? Apologies for the term Hinayana but this question is borne out of those discussions.

So - is Theravada Buddhism the only modern representative on Hinayana Buddhism or are there another current branches of Buddhism, no matter how minor, that could also be termed 'Hinayana'. Or in other words would Theravada be completely synonymous with 'currently existing Hinayana Buddhism'.
Hinayana is complicated philosophical term, sometimes it refer to lower motivation, sometimes to some misunderstanding of Teaching, sometimes to smaller knowledge, or restricted acceptance of Buddha's Teaching, and sometimes it's misnomer for early schools. I want to stress, that term is philosophical from just a few of Mahayana sutras. It is not a simple thing as school, (and Mahayana is not a school too).

Hinayana as type of motivation (lower than reaching Buddhahood) is acceptable lower motivation in Mahayana schools for some types of personalities. So, in that sense Hinayana is survived inside of any Mahayana school, which accepts such notion.

In the sense of non-Mahayana: many Mahayana schools accept and their canons contain non-Mahayana teachings. All traditional Mahayana schools actually have survived vinaya lineages of early schools, not related to Mahayana doctrines.

On the other hand, Theravada developed bodhisatta practices and philosophical concepts which thought by some to be distinctively mahayanistic. It just don't generally accepts Mahayana canon, but don't officially denies either. So it's personal choice to accept it or not. Some Theravada scholars studied Mahayana, for example famous Walpola Rahula, he even wrote dissertation on Abhidharmasmuccaya with parallels to Pali canon.