Hey!
Your structure seems absolutely fine - you don't necessarily need a separate paragraph on the quality of training, especially if you don't have enough meaningful detail to justify one. It's better to keep your points concise and well-supported than to add a standalone section that feels light and slightly empty.
If you've attended insight days and spoken to trainees but didn't get a single standout "unique" point, you can still weave training into another paragraph. For example, you can reference the firm's reputation for thorough, hands-on training or the consistency you heard from trainees, without needing a dramatic "USP". It's better to be honest and grounded than forcing detail that isn't there.
Overall, your three-part structure (which is similar to what I would usually follow) is perfectly acceptable. What matters most is that each point is specific, genuine, and tied back to why you want to train there.