You really have to respect the individual who has spent significant resources, but mostly their time on learning how to craft a display. It is clear in the entire outline and structure. That is why I would rate #4 quite high.
My personal critique of display #4.
I am assuming this is a deciduous, but then again I am not the strongest in knowledge of plants. If so, this is a Gyou no Shin 行の真 (Semi Formal plant in a Formal Styling). I am going to rate this styling as a Shakkan...Pot is matched. Maybe it is just the camera angle, but it seems the pot is placed slightly left of center, which is absolutely correct. This helps to accentuate the flow of the display, elongating the invisible triangle between the three objects.
1. Criticisms of the display are minor, but Ume blossoming is an early spring indicator, so if this is a deciduous tree, then it would be better to display a tree that is just starting to develop leaf buds to be congruent. (If it is a broadleaf evergreen, then ignore this and scratch the entire first paragraph, as it would be incorrect.)
2. The stand for the kusamono feels a bit too tall and formal to my eye.
Seriously, why isn't Smoke asked to be the judges of these events....