The Dutch winger, who should become a Wednesdayite favourite very soon, scored the opening and closing goals in a 5-1 mauling of Grimsby's second string - the first of which was an impressive solo effort.
Small made it 2-0 with an excellent run and shot just after half time with youngsters Jason Bradley and Luke Boden making it 4 before Esajas' second.
The young strike duo replaced Akpo Sodje and Francis Jeffers at half time as the two new signings now look ahead to Preston on Saturday.
Wednesday were 5-0 up before Grimsby pulled back a late consolation.
In other news, former 'keeper David Lucas, one of the star's of the club's 2005 promotion campaign, has signed a short-term deal at Leeds United after being released by Barnsley.