Natori felt he had a slight advantage with this training. For starters he had slightly better chakra control than the average genin and he was used to the whole balancing act being that it was used so often when traveling on his sand. Still it was quite to this level. "I suppose blocking and using my sand wouldn't be very wise or fair would it?" He asked in a somewhat respectful, yet curious voice. It was a natural question. He had no idea if using his sand would allow him to learn to better control and focus in the use of his chakra. Still he would understand if it was not allowed. It would give him a further advantage over the older shinobi. 

"Don't take me too lightly. I won't let you win just because you're older." He said with a slight grin teasing his comrade. He was letting his guard down a bit. Strange for him, but he felt if he were to return to Suna without at least making one friend he'd likely hear it from his brother and father. He had to build bonds further than he was used too. This was a small step in leaving the metaphorical shell he'd been locked in for so long. 

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Mario was in his his study as Kombei had said. He was deep in thought meditating while on his knees with his eyes closed when Leiko entered. "That Kombei sent you didn't he?" He asked as he opened his eyes and looking in the girl's direction. "I'd have preferred to wait until after proper chakra training had been done with each of the students before beginning my own training with you all, but this is just as well I suppose." He said calmly as he stood up and motioned for her to enter. "It would be best to watch and teach you to properly control, manage and utilize your chakra myself so as to avoid problems. The use for ninjutsu is different compared to the use in Fuinjutsu after all." He began speaking as if speaking to himself, but this information was aimed towards Leiko. "The focus and concentration required is great. It will be much more difficult for you being a jinchuriki though. Do you understand this?" He asked the girl calmly as he kept his gaze and attention focused on her.