If you invert the recommended number of times and then allow to sit for the diffusion part, you could then invert again and then pour out just to be on the safe side to make sure that none of the diffused fix remains in the bottom. As others have said the Ilford method is, strictly speaking, agitation only and consists of a 5,10,20 inversion routine only. I must admit that I too tend to add a couple of extra cycles i.e. a quick swish and dump initially then 5,10,15,20,25 inversions but that may be my "glass half empty" mentality and I have to admit that when I first started out and ignorance was bliss I just did what Ilford said. Now 13 years later none of my early 5,10,20 films seem to have suffered.
pentaxuser