For issues like this, I actually sometimes think that it is a little bit misleading to refer to the preceptors, whether bhiksus or bhiksunis, as "Mahayana" monks or nuns. After all, their preceptor status is due to their bhiksu/ni upasampada, and nothing to do with their bodhisattva precepts. It may be more appropriate to refer to them primarily as "Dharmagupta" bhiksu/nis, with a note of the Mahayana bodhisattva precepts, both through the Chinese traditions, as really quite secondary.
Interesting to note that the above Venerables are thus technically my Dharma sisters, hehe.
(We have the same upadhyaya.)