He and Kanda debuted in Toryumon as a heel team, causing mayhem in matches and frequently forcing double countouts to disappoint fans and ruin shows.

During this time, Yokosuka formed a long lasting tag team with K-ness (formerly known as Darkness Dragon), and continued to establish himself as a choker.

He and K-ness would make it to the finals of the inaugural Rey de Parejas Tournament in 2003, but lost to Dotti Shuji and Brother Yasshi.

After Masaaki Mochizuki was kicked out of Aagan Iisou, he reconciled with him, Second Doi, and Kenichiro Arai, and after K-ness returned from a stint of injury, the five of them would form Final M2K.

On April 23, he usurped Ryo Saito as Open the Dream Gate Champion,[8] and soon after, Mochizuki named him the leader of Final M2K so he could join Magnum TOKYO in his short-lived Renaissance project.

This tandem brought him success, as he and Saito would win the WAR I-J Heavyweight Tag Team Titles in July and had two reigns as Open the Triangle Gate Champions with CIMA.

[10] In 2008, he and Saito added another title to their list of accolades, winning the Open the Twin Gate Championship from Kenichiro Arai and Taku Iwasa on May 5.

The rest of the year remained quiet for him up until the end, when he, Ryo Saito and Dragon Kid lost a Unit Split Survival Three-Way Nine-Man Tag Match against teams from World-1 and Real Hazard.

He continued his team with Saito, and they were given a shot at the Open the Twin Gate titles held by YAMATO and Cyber Kong on February 15, 2009.

They would hold the titles until May 5, when they lost them to Ryo Saito and Genki Horiguchi in a Three-Way Match that also included Kenichiro Arai and Yasushi Kanda.

Muscle drew Yokosuka's attention away from a tag match that he and Gamma were in against Naruki Doi and BxB Hulk, causing them to lose.

An unknown new member of Real Hazard was then scheduled to take Saito's place in all of his matches for the remainder of the tour, and five days later, it was revealed to be K-ness.

However, they all found themselves on the losing end of trios matches, with Horiguchi taking the fall every time, and a divide formed in Real Hazard over the clean fights issue, with them on one side and Yasushi Kanda, Kzy, and Takuya Sugawara - who wanted to win through illegal methods - on the other.

On February 10, after KAGETORA accidentally cost Sugawara a shot at becoming the next challenger for the Open the Dream Gate Title, tensions boiled over.

After the longest reign in the title's history, with four successful defenses, Yokosuka and K-ness lost the Open the Twin Gate Championship to Gamma and Naruki Doi on November 23, 2010.

On April 14, 2011, Yokosuka, BxB Hulk and PAC failed to win the Open the Triangle Gate Championship from Blood Warriors (CIMA, Dragon Kid and Ricochet) and as a result World-1 was forced to disband.

[12] On April 24 former World-1 members Yokosuka, BxB Hulk, PAC and Masato Yoshino agreed to form a new alliance with Masaaki Mochizuki to battle Blood Warriors.

[16] The following day, Susumu and KAGETORA defeated Akira Tozawa and BxB Hulk to win the Open the Twin Gate Championship.

On June 19, Susumu and Jimmy Kagetora defeated T-Hawk and Big R Shimizu to win the Open the Twin Gate Championship.