You are comparing apples to oranges. Your IPv6 trace will
never show the POI because there is a tunnel directly from your computer/client to the 6to4 tunnel server (HE in this case). Don't forget that between the first and second hops of your IPv6 trace, your packets still have to traverse hops 2-5 of your IPv4 trace.
In short, your IPv6 trace won't show the IPv4 hops between you and the tunnel server.
Let me give you an example. I have a 6in4 tunnel set up from my router to HE's Toronto tunnel servers. I'm going to combine an IPv4 and IPv6 traceroute to show you how my packets actually travel:
Here's my IPv4 trace to the tunnel server:
whistler:~ tyson$ mtr -4rw tserv21.tor1.ipv6.he.net
HOST: whistler.lan Loss% Snt Last Avg Best Wrst StDev
1.|-- cypress.lan 0.0% 10 0.4 0.3 0.2 0.4 0.0
2.|-- v250-rn-rt-uwt.uwaterloo.ca 0.0% 10 2.2 2.0 1.8 2.6 0.2
3.|-- rn-rt-mc-1-1-a-rn-rt-uwt.uwaterloo.ca 0.0% 10 2.1 2.0 1.8 2.5 0.2
4.|-- 172.16.31.53 0.0% 10 0.9 2.5 0.6 15.5 4.6
5.|-- 172.16.31.97 0.0% 10 0.7 0.7 0.5 1.0 0.1
6.|-- 172.16.31.118 0.0% 10 0.9 0.8 0.7 1.0 0.1
7.|-- 172.25.1.105 0.0% 10 0.9 0.8 0.7 0.9 0.1
8.|-- 66.97.28.65 0.0% 10 1.0 1.1 0.9 1.2 0.1
9.|-- be120.p01-lond.orion.on.ca 0.0% 10 9.5 9.3 9.1 9.5 0.1
10.|-- be5.p01-york.orion.on.ca 0.0% 10 9.2 9.2 9.0 9.4 0.1
11.|-- be201.gw01-toro.orion.on.ca 0.0% 10 9.3 9.2 9.0 9.7 0.2
12.|-- gw-he.torontointernetxchange.net 0.0% 10 11.7 13.3 11.1 16.9 1.6
13.|-- tserv1.tor1.he.net 0.0% 10 9.0 9.4 8.9 11.4 1.0
And here's my IPv6 trace to my VPS in Cedar Knolls, NJ:
whistler:~ tyson$ mtr -6rw blackcomb.tppnw.com
HOST: whistler.lan Loss% Snt Last Avg Best Wrst StDev
1.|-- cypress.lan 0.0% 10 0.4 0.5 0.4 0.7 0.1
2.|-- hurricane-electric-tunnel-server-endpoint.lan 0.0% 10 11.4 11.7 11.4 12.2 0.4
3.|-- gige-g2-5.core1.tor1.he.net 0.0% 10 9.5 10.5 9.4 17.4 2.5
4.|-- nac.ip6.torontointernetxchange.net 0.0% 10 22.2 22.3 22.1 23.0 0.3
5.|-- e1.2.tbr1.mmu.nac.net 0.0% 10 22.0 22.0 21.6 22.8 0.3
6.|-- vlan801.esd1.mmu.nac.net 0.0% 10 22.2 22.2 22.0 22.6 0.2
7.|-- 2001:518:2800:3::2 0.0% 10 22.0 22.4 21.9 24.1 0.7
8.|-- blackcomb.tppnw.com 0.0% 10 22.3 22.3 21.9 23.9 0.6
Now combined, this is the route the packets take:
1 --> cypress.lan (my router) [IPv6 hop 1]
====== IPv6 packets are encapsulated in IPv4 packets
2-13 --> UW routers to HOT to Orion, through TorIX to HE [IPv4 hops 1-12]
====== Encapsulation is removed and IPv6 packets travel alone
14-15--> HE's Toronto core routers/tunnel server [IPv6 hop 2-3]
16-18--> NAC's (colo provider) IPv6 link from TorIX to their colo [IPv6 hops 4-6]
19-20--> VPS provider's routers and finally, my server [IPv6 hops 7-8]
So you see that my packets actually took 20 hops, but neither protocol took more than 12 hops. Like I said before, you'll never see the POI in an IPv6 traceroute because your IPv6 route is tunneled.