Using multiple theoretical insights in research is good, provided the approach is justified and well-implemented. Applying multiple theories can enrich the analysis, broaden perspectives, and more comprehensively address complex phenomena. However, it also comes with challenges that must be carefully managed.

Using different theoretical insights affords you the opportunity to analyze multifarious idiosyncrasies and philosophies.

Nigeria's female literature is replete with ideas you could incorporate. Emecheta, Nwapa, Adichie, Ekwugo, etc.

I suggest 3 to 4 theories in a PhD level research.

I strongly agree with using multiple theoretical insights in research, as it provides a more comprehensive, rigorous, and nuanced understanding of complex phenomena. However, it requires careful integration, clear justification, and alignment with research objectives to avoid overcomplication or theoretical incompatibility. When done effectively, it enhances the study's depth and applicability.

You can operationalize silence (erasure, constraint, or strategic quiet) and voice (testimony, narration, dialogic resistance) by pairing Olsen’s account of the forces that mute women writers with Mohanty’s critique of homogenizing “Third World woman” narratives.

It really depends on your research scope and academic context goals. Focusing deeply on 3 to 4 theorists is usually enough to build a strong and meaningful foundation.

Of course, I say this as a student who is still learning. I may not fully know the criteria or expectations of a PhD. But what I do know is that clarity and depth often matter more than sheer numbers.

Sometimes, less is more, especially when it allows us to engage critically, rather than superficially, with the thinkers who shape our work.