Eric Flint writes:
"I enjoy The High Crusade...but I'd find it somewhat awkward to write my own story in that setting. More precisely, I'd find it difficult to write a story in that setting that stayed true to Anderson's own vision of it. And doing so, I think, is important for this kind of anthology." (pp. 181-182)
I agree. But not every story in this anthology does meet that requirement. How easy is it for one writer to continue another author's series authentically while also exercising his own literary strengths and talents? Indeed, can it even be done? Any series can be continued nominally, of course. Just write a new book and call the hero "Holmes" or "Bond" etc.
To continue either CS Lewis' juvenile fantasy series or his adult sf series, it would be necessary to share, or at least intimately empathize with, Christian faith in general and Lewis' Platonic formulation of it in particular. And I think that Poul Anderson could have done that.
Astrid Anderson Bear writes:
"Characters don't die when an author does. They are still there in the books and stories, treading the well-worn paths of their adventures. But it is bitter-sweet to contemplate my Dad's characters hoisting a mug together in the Old Phoenix Tavern, wishing they could have another outing in their home worlds." (p. 184)
The Old Phoenix can be entered from any world so Poul Anderson would certainly be there with them.