Thank you for posting this great video. You can see the elite skating ability in that rush up the ice. Bobby's partner on D was Gilles Marotte (#10), who was in his 2nd NHL season and was very highly regarded.
If you recall, Marotte was included in the famous Esposito, Stanfield, Hodge trade, along with Pit Martin and G Jack Norris. The Hawks were thrilled to get Marotte, but he never lived up to the very lofty expectations, but had a solid 12-year NHL career with da Broons, Hawks, Kings, Rangers, and Blues. He was traded from the Hawks in Feb 1970 in a trade, that ironically included Jim Stanfield going to the Kings with goalie Dennis DeJordy, in exchange for G Gerry Desjardins, D Bill White, and C Brian Campbell. The trade was a steal for the Hawks. The Hawks won the league that year before losing to da Broons in 4 straight in the 2nd round (Game 4 was one of the best games I have ever seen, won on a McKenzie goal 5-4 in the last 2 minutes; Dan Kelly's call was classic: "Cleared by the Hawks, but not out; McKenzie to Stanfield, back to McKenzie," and then he was silent because the Gahden crowd told the viewers that Pie scored (top shelf short side over Tony O)). The Hawks went to the finals in 71 and 73, losing to Montreal both times (they should have won that series in 71; Hawks were up in Game 7, 2-0, when Bobby Hull hit the post, and then "Onery" Richard scored from 85 feet to make in 2-1).
I've posted before that the Esposito trade was not seen as that lopsided at the time it was made. Esposito had better stats than Pit Martin at the time -- 104 pts vs 71 pts in their two previous seasons. Pit Martin was da Broons' only 20-goal scorer the previous season, to Bucyk's 18, and Pie McKenzie's 17. He would have 4 seasons with the Hawks of 29 or more goals. Ken Hodge had 132 GP, 16 G, 42 A and 58 pts in his two-year NHL career, and Fred Stanfield had 107 GP, 10 G, 12 A for 22 pts. Not great stats. Despite losing both Bernie Parent and Doug Favell to the Flyers in the expansion draft, da Broons still had Cheevers and EJ in goal, so trading Jack Norris seemed reasonable. Of course all 3 players acquired by Milt Schmidt exploded with their new team, making the trade of the best 5 trades of all time in the NHL, perhaps the best.