One thing to say right off the bat is you should not eliminate all lower body work from the training. Certainly reducing the volume and/or intensity (and possibly frequency) would be a good idea but if you don’t continue to do some lower body work, IMO, your power will start to decrease at a higher rate due the lack of strength maintenance work than it would with the inclusion of such training.
I would say with regards to the lifting in the winter that you would still likely be better off by doing at least a small volume of sprint work and plyos during phases of even a strength power focus. This is the concept of vertical integration. I don’t see a problem with a month or so of weights but some speed work (even in the form of hills) done more year around would likely be a better idea.
I would venture to say that if you were doing sprint work over a longer period of time than to just bring into the training later, your opportunity for greater speed development will be increased over performing the training serially. Vertical integration.
I can’t recommend CF’s works enough to achieve a better understanding of these concepts.