
Developing nuance within a phrase or line of music can be allusive, especially for a large choir. Even with all the effort that one singer might make, it won't be enough. The entire group needs to produce together as one big whole to get the job done. Breathing energy into the vowel sounds between the consonants in a phrase is what must be developed. We sing on the vowels. Consonants, of course, are essential to intelligible diction, but they usually break up the line.
We Americans tend to be lazy speakers. We barely open our jaws or use our tongues to enunciate when speaking. That does not translate well to beautiful singing. In order to make beautiful vowel molds, the jaw must be down in the "two finger" position which makes it harder for the tongue to work to create the proper vowel molds. We also tend to speak without engaging our abdominal wall muscles in order to project. We also forget to breathe deeply enough to have the power to support a tone through entire phrases.
Beautiful singing absolutely requires attention to good breathing, proper support, and utilizing the teeth, tongue and jaw to make the diction intelligible. But what happens between the consonants is what is so important to beautiful singing. The tone line should be disrupted for as little time as possible.
The consonants should only break up the line briefly. Some words have strings of consonants like "str," "rld," "schw," and "fths." Words with strings of consonants are difficult enough to pronounce while speaking and even harder while singing. A conductor may drill the chorus in difficult pronunciations in order to get the diction he is after from his group and quickly enough not to disrupt the phrasing.
Crisp diction is great but the nuance of dynamics and warmth of color still happen while the chorus is singing on the vowels. So be aware of what happens while singing from consonant to consonant.

I am still amazed that we were able to get such a beautiful performance after singing through the song just a couple of times.