@primesgenato
I really like the way you used references in explaining the lesson, but I am a native Tagalog speaker and I could only say that some sentences are awkward (should I say incorrect?) based on how we use it formally. Like the only thing acceptable in your reference based on how we use the language are the following:
1. Mga masisipag na bata
2. Masisipag na mga bata
We don't use the following formally (because it is not correct?) because the adjective does not agree with the word "mga"
1. Mga masipag na bata X
2. Masipag na mga bata X
The sentences may sound okay and you may reiterate how reliable and educated the authors are, but I, as a native speaker, cannot agree. In fact, I strongly disagree.