Thank you for the answer. Regarding Richard's scoliosis, you may not have been far off the mark attributing it to a fall from a horse; since Richard's scoliosis is described as idiopathic adolescent onset scoliosis, that is, it started without a known cause, some historians are now speculating if he may have had an accident that started it.
Regarding Richard and Elizabeth of York, I think the information on the Portuguese double marriage plans may not affect fundamentally how we see their relationship, but one difference that comes to mind is that she would have probably known that Richard was not going to marry her, far before he sent her from the court to Sheriff Hutton and publicly denied the rumors. Since the English delegation was sent to Portugal less than a week after Anne's death, it's likely that this had been discussed long before, as an important matter of state (especially since, apparently, the possibility of the marriage to the Spanish infanta was discussed as an alternative) and Elizabeth would probably be told about it as it concerned her. There's been a lot of discussion and speculation about the infamous letter from Elizabeth to John Howard that George Buck claimed to have seen; now quite a few people think Buck may have misinterpreted it, and that the marriage it referred to was the proposed Portuguese double marriage rather than Elizabeth wanting to marry Richard, but there are still different opinions about what the letter was really saying (if it existed, though I think it did, I don't believe Buck would have just made it up), especially since even the second hand account survives only in fragments.
Regarding Richard and Elizabeth of York, I think the information on the Portuguese double marriage plans may not affect fundamentally how we see their relationship, but one difference that comes to mind is that she would have probably known that Richard was not going to marry her, far before he sent her from the court to Sheriff Hutton and publicly denied the rumors. Since the English delegation was sent to Portugal less than a week after Anne's death, it's likely that this had been discussed long before, as an important matter of state (especially since, apparently, the possibility of the marriage to the Spanish infanta was discussed as an alternative) and Elizabeth would probably be told about it as it concerned her. There's been a lot of discussion and speculation about the infamous letter from Elizabeth to John Howard that George Buck claimed to have seen; now quite a few people think Buck may have misinterpreted it, and that the marriage it referred to was the proposed Portuguese double marriage rather than Elizabeth wanting to marry Richard, but there are still different opinions about what the letter was really saying (if it existed, though I think it did, I don't believe Buck would have just made it up), especially since even the second hand account survives only in fragments.