Because there's a bunch of different questions:
1. Which lawyer's did a better job? Answer: Trump's lawyers did...the House managers underperformed. Busker slighted the Trump lawyer by saying he was an ambulance chaser. He gave a pretty good case despite not being one of the Ivy League grads and did a better job than they did.
2. Was Trump guilty? Answer: No. He did not incite the crowd under the legal definition of incitement. The House managers could have brought a different charge, but they didn't. Trump was acquitted of the charge.
3., Who was going to win? Answer: Given the charge levelled, the outcome was pretty much preordained.
4. Was it a good idea then to bring the impeachment charge for incitement? Answer: Unclear. Depends on whether you believe in moral victories. Tactically it didn't work out great for the Ds (see 2 above). Their consolation prize is dividing the establishment and populist wings of the R.
5. Did the Senate have the authority to remove a President no longer sitting? Answer: Unclear but neither McConnell nor Roberts seem to think so.
7. Does that mean that Trump didn't do anything wrong? Answer: No., and that's where McConnell's speech was brilliant.