Answers

It looks like the mason did a good job concerning the texture. But the color is way off. Unfortunatly its not easy to match new to old. The good news- Staining morter isnt hard to do if its not sealed. I suggest a few practice bricks and some best efforts at staining them to match, then do the rest. The bad news- it will probably never be pefect and if it is it will show after a few years of all that Texas weather torture.

Talk with your local tree nursery or a state university agricultural extension office.  (Iowa State University has an excellent one.)  I love willows, but if the damage is too severe, you may need to begin again.

Be certain that this is something you plan to use for years and years as the ROI on homeowner-specific improvements are not very high.  Budget for the concrete work involved is usually around $15-20K alone, not including the poles and painting.  If you plan to sell your home in less than 10 years or would need the court for less than 10 years, don't do it.  A new upgraded entry way, minor kitchen update, interior room/living space addition or new Hardie Board siding will give you a much better return on investment.