As time passes, the point of the current best-performing tool gets pushed and compressed to the left side of the plot. At some point, an observer may easily overlook the point of the best-performing tool if it is on the far left side of the plot.
Idea:
Draw an horizontal segment between the point of the best-performing tool and the right side of the plot (equal to the time of the most recent submission). When placing the mouse cursor on this segment, display the information about the best-performing tool.
Take the following plot as example:
As time passes, the point of the current best-performing tool gets pushed and compressed to the left side of the plot. At some point, an observer may easily overlook the point of the best-performing tool if it is on the far left side of the plot.
Idea: