Looking at the diagram below, you can see why Traceroute #8 looks the way it does.
Out of all the probes and TTL exceeded messages the only packet to traverse the congested link, depicted with the bolded red arrow between MIN and DVR, is the TTL exceeded message generated by MIN. The rest of the packets traverse one or more links in the top (SVL > SEA > MIN > OMH) or bottom (OMH > TUL > PHX > SVL) paths.
For traceroute its possible for every packet, whether the probes or the TTL exceeded message, to take a path unique of the other traceroute packets. In the forward path for example probes may take different paths to reach the destination; this can happen if multipath is enabled for example. In the reverse path TTL exceeded messages can take different paths than the probes in asymmetric routing environments (the internet for example).
In this example the latency increase at hop 3 would not be a concern as it relates to performance between 10.10.10.2 and 10.10.10.6. This is because traffic between these two hosts never traverses the congested link (MIN > DVR). The forward path follows the top of the diagram (SVL > SEA > MIN > OMH) and the reverse path follows the bottom of the diagram (OMH > TUL > PHX > SVL).